Upcoming

Club Events

Eat Well Wednesdays

Join us every Wednesday for a healthy entree and specialty salad special.


Club Events

DJ Trivia in Ballroom

Dive into DJ Trivia We are going to continue holding DJ Trivia in the ballroom (events and space permitting) for the month of February to accommodate more teams. To enhance the experience, registration will be done through the Invited App under "Events Calendar" for each individual Wednesday. Spots are limited to ten teams and each team can have a maximum of 8 players. You can call the front desk at 724-625-2220 to reserve your spot as well. To ensure your team is ready for DJ Trivia, you MUST have registered under the event, not in the Arnie's Tavern dining space. Please include your team name in the notes section. Special Note- If you already had a reservation for upcoming nights, your reservation has automatically been transferred to the new event page.


Register

Club Events

Taste of Italy

Join us for a New & Improved twist on a Treesdale favorite! Chef attended pasta action station with Salad Station, Assorted Pizza, Two Dinner Entrees and Dessert Station.


Club Events

Fresh Catch Friday

Fresh Catch Friday *Available in Arbor Grille or Arnie's Tavern


Club Events

Rivers Club - Galentine's Day @ Rivers Club

Galentine's Day ​Friday, February 7 5:00PM Celebrate friendship and fun for Galentine's Day! This special evening is all about honoring the amazing women in your life. Whether you’re gathering with close friends, family, or coworkers, it is the perfect chance to enjoy good company, laughter, and plenty of love. Reservation Required Register on the Invited App or with your Club Concierge at 412.391.5227


Register

Club Events

GM Reception - Coffee & Donuts

GM Reception - Donuts and Coffee Saturday, February 8 11am-12pm Stop by Arnie's and chat with Donato, our General Manager while you enjoy complimentary Donuts and Coffee.


Club Events

Sunrise Sunday Breakfast

Sunrise Sunday Ala Carte Breakfast Menu Available from 10am-2pm Arnie's All Day Menu Available after 11am


Club Events

Big Game To Gos

Big Game Package $175++ Each package feeds 8-10 people and includes 8 lbs. of wings (choice of 2 sauces) Chicken Quesadillas Chips & Chorizo Queso ADD ONS (Feeds 8-10 people): 8lbs Wings $125 Quesadilla $35 Chips & Chorizo Queso $30 Final Date to Order Your To-Go Package is February 6th Pick-up on Game Day February 9th between 12pm-2pm


Club Events

The Big Game Tailgate Party

The Big Game Tailgate Party Sunday, February 9 5pm-7:30pm Join us in Arnie's all day to celebrate The Big Game! We will offer a Special Tailgate Limited Menu from 5pm-7:30pm. Arnie's All-Day Menu available from 11am-5pm.


Club Events

Treesdale - Ladies Night Out - Galentine's Market @ Treesdale Golf and Country Club

Ladies' Night Out - Galentine's Day Tuesday, February 11 6pm Grab a friend and stop by the Clubhouse for a one stop shop. We will have vendors from all different corners of Pittsburgh right at Treesdale. You will get the opportunity to shop Jewelry, hats, clothing, cookies, skincare, decor and so much more.


Register

Club Events

Eat Well Wednesdays

Join us every Wednesday for a healthy entree and specialty salad special.


Club Events

DJ Trivia in Ballroom

Dive into DJ Trivia We are going to continue holding DJ Trivia in the ballroom (events and space permitting) for the month of February to accommodate more teams. To enhance the experience, registration will be done through the Invited App under "Events Calendar" for each individual Wednesday. Spots are limited to ten teams and each team can have a maximum of 8 players. You can call the front desk at 724-625-2220 to reserve your spot as well. To ensure your team is ready for DJ Trivia, you MUST have registered under the event, not in the Arnie's Tavern dining space. Please include your team name in the notes section. Special Note- If you already had a reservation for upcoming nights, your reservation has automatically been transferred to the new event page.


Register

Club Events

Taste of Italy

Join us for a New & Improved twist on a Treesdale favorite! Chef attended pasta action station with Salad Station, Assorted Pizza, Two Dinner Entrees and Dessert Station.


Dining Events

Diamond Run Golf Club - Sweetheart Dinner for 2 To-Go @ Diamond Run Golf Club

Sweetheart Dinner for 2 To-Go – A Romantic Feast at Home Celebrate love this Valentine's Day with a special, gourmet dinner for two, crafted to make your evening unforgettable. Our Sweetheart Dinner for 2 To-Go includes a thoughtfully prepared meal featuring the finest seasonal ingredients, allowing you and your special someone to indulge in a romantic dining experience from the comfort of your own home. Sweetheart Menu Includes: Pear and Romaine Salad Romaine lettuce, toasted walnuts, pears, crumbled bleu cheese, celery seed dressing Rolls with Butter Two- 8oz Filets, Demi Two- Lobster Tails, Drawn Butter Mashed Potatoes, Roasted Baby Carrots and Green Beans NY Style Cheesecake Macerated strawberries, whipped cream, mint Use the link below to place your order: Order Here!


Club Events

Treesdale Golf & Country Club - Valentine's Day Dinner @ Treesdale Golf & Country Club

Valentine's Day Dinner February 14 5:30pm MORE DETAILS TO FOLLOW


Register

Club Events

National Butterscotch Day

Celebrate National Butterscotch Day and enjoy a delicious butterscotch treat from your Friends at Treesdale!


Golf Events

Invited Couples Tournament

Invited Couples Tournament Sea Island Resort | Sea Island, GA March 2 - 6, 2025 For 96 years, The Sea Island Resort has been synonymous with world-class golf and hospitality. Meet members from around the country and enjoy the resort’s top-of-the-line facilities while competing with your mixed partner. Our Invited event entry fee includes four nights of lodging and four five rounds of golf, meals, open bars at group functions, all taxes and resort fees, and more! Registration is limited to 40 teams! Once capacity is reached, you will no longer be able to register. REGISTER NOW: https://couples25seaisland.golfgenius.com/pages/11062703186149128411


Club Events

Sweetheart Crafternoon @ Sunrise Sunday Breakfast

Sunrise Sunday Ala Carte Breakfast Menu Available from 10am-2pm Arnie's All Day Menu Available after 11am


Club Events

Eat Well Wednesdays

Join us every Wednesday for a healthy entree and specialty salad special.


Club Events

BBQ Week

BBQ Week Wednesday, February 19 - Saturday, February 22 Enjoy Chef's delicious BBQ Feature Menu all week in celebration of National BBQ Week!


Club Events

DJ Trivia in Ballroom

Dive into DJ Trivia We are going to continue holding DJ Trivia in the ballroom (events and space permitting) for the month of February to accommodate more teams. To enhance the experience, registration will be done through the Invited App under "Events Calendar" for each individual Wednesday. Spots are limited to ten teams and each team can have a maximum of 8 players. You can call the front desk at 724-625-2220 to reserve your spot as well. To ensure your team is ready for DJ Trivia, you MUST have registered under the event, not in the Arnie's Tavern dining space. Please include your team name in the notes section. Special Note- If you already had a reservation for upcoming nights, your reservation has automatically been transferred to the new event page.


Register

Club Events

BBQ Week

BBQ Week Wednesday, February 19 - Saturday, February 22 Enjoy Chef's delicious BBQ Feature Menu all week in celebration of National BBQ Week!


Club Events

Taste of Italy

Join us for a New & Improved twist on a Treesdale favorite! Chef attended pasta action station with Salad Station, Assorted Pizza, Two Dinner Entrees and Dessert Station.


Club Events

GM Reception

GM Reception -Happy Hour Thursday, February 20 4pm-5pm Stop by Arbor Grille and chat with Donato, our new General Manager while you enjoy complimentary hors d'oeuvres


Club Events

BBQ Week

BBQ Week Wednesday, February 19 - Saturday, February 22 Enjoy Chef's delicious BBQ Feature Menu all week in celebration of National BBQ Week!


Club Events

Fresh Catch Friday

Fresh Catch Friday *Available in Arbor Grille or Arnie's Tavern


Club Events

Bourbon Tasting

Bourbon Tasting in Arbor Grille Friday, February 21 6pm-8pm $20++ Per Person Join us in the Arbor Grille for an informal Bourbon Tasting. Sample some of the finest spirits while learning about each bourbon. Stay for dinner and enjoy our BBQ Week Dinner Features.


Register

Golf Events

Diamond Run Golf Club - Callaway Fitting @ Diamond Run Golf Club

Swing by the Simulator building at the Driving Range to get fitted in the newest line of Callaway clubs. Call the Pro Shop to reserve a time slot.


Club Events

BBQ Week

BBQ Week Wednesday, February 19 - Saturday, February 22 Enjoy Chef's delicious BBQ Feature Menu all week in celebration of National BBQ Week!


Club Events

Treesdale Golf & Country Club - Spirits & Wild Game Dinner@ Treesdale Golf & Country Club

Spirits & Wild Game Dinner Saturday, February 22 6pm $110++ Per Person Chef Steven and his team have selected the finest game for this special occasion. You're in for quite a delicious and unique experience with this one.


Register

Club Events

Sunrise Sunday Breakfast

Sunrise Sunday Ala Carte Breakfast Menu Available from 10am-2pm Arnie's All Day Menu Available after 11am


Club Events

Eat Well Wednesdays

Join us every Wednesday for a healthy entree and specialty salad special.


Dining Events

Rivers Club - Chef's Cooking Class @ Rivers Club

Chef's Cooking Class Wednesday, February 26 6:00PM Join Chef Jim for an exclusive three-course cooking class where you'll learn to create a delicious, restaurant-quality meal! Throughout the class, Chef Jim will guide you step-by-step in preparing a three-course meal that will dazzle your next dinner party guests. After the demonstrations, you'll enjoy the scrumptious dishes you've learned to prepare. Don’t miss this chance to refine your culinary skills and savor an unforgettable meal! Menu: Artisan greens and Frisee salad Port wine poached pear, Herbed Goat cheese wrapped in phyllo, Port wine vinaigrette Roast Tenderloin Champignon Robuchon Mashed Potatoes, Bouquetier of Vegetable, Pinot Noir demi-glaze Butternut Squash Panna Cotta Pickled Cranberries, Almond Crumble $65 Reservation Required Register on the Invited App or with your Club Concierge at 412.391.5227 48-hour cancellation policy is in effect.


Register

Club Events

DJ Trivia in Ballroom

Dive into DJ Trivia We are going to continue holding DJ Trivia in the ballroom (events and space permitting) for the month of February to accommodate more teams. To enhance the experience, registration will be done through the Invited App under "Events Calendar" for each individual Wednesday. Spots are limited to ten teams and each team can have a maximum of 8 players. You can call the front desk at 724-625-2220 to reserve your spot as well. To ensure your team is ready for DJ Trivia, you MUST have registered under the event, not in the Arnie's Tavern dining space. Please include your team name in the notes section. Special Note- If you already had a reservation for upcoming nights, your reservation has automatically been transferred to the new event page.


Register

Club Events

Taste of Italy

Join us for a New & Improved twist on a Treesdale favorite! Chef attended pasta action station with Salad Station, Assorted Pizza, Two Dinner Entrees and Dessert Station.


Club Events

Kid's Night Out - Seed Planting

Kid's Night Out - Seed Planting Thursday, February 25 5:30pm Bring the Kids to the Club and allow them to plant some seeds. It will be fun to watch them grow. We will then transfer them to the garden when the time is right! More Details to Follow


Register

Club Events

Live Music in Arnie's - Brian Belonzi

Live Music in Arnie's 6pm


Club Events

Fresh Catch Friday

Fresh Catch Friday *Available in Arbor Grille or Arnie's Tavern


Club Events

Wednesday,
Feb 05
11:00 a.m.

Eat Well Wednesdays

Join us every Wednesday for a healthy entree and specialty salad special.

Club Events

Wednesday,
Feb 05
6:30 p.m.

DJ Trivia in Ballroom

Dive into DJ Trivia We are going to continue holding DJ Trivia in the ballroom (events and space permitting) for the month of February to accommodate more teams. To enhance the experience, registration will be done through the Invited App under "Events Calendar" for each individual Wednesday. Spots are limited to ten teams and each team can have a maximum of 8 players. You can call the front desk at 724-625-2220 to reserve your spot as well. To ensure your team is ready for DJ Trivia, you MUST have registered under the event, not in the Arnie's Tavern dining space. Please include your team name in the notes section. Special Note- If you already had a reservation for upcoming nights, your reservation has automatically been transferred to the new event page.

Register

Club Events

Thursday,
Feb 06
5:00 p.m.

Taste of Italy

Join us for a New & Improved twist on a Treesdale favorite! Chef attended pasta action station with Salad Station, Assorted Pizza, Two Dinner Entrees and Dessert Station.

Club Events

Friday,
Feb 07
5:00 p.m.

Fresh Catch Friday

Fresh Catch Friday *Available in Arbor Grille or Arnie's Tavern

Club Events

Friday,
Feb 07
5:00 p.m.

Rivers Club - Galentine's Day @ Rivers Club

Galentine's Day ​Friday, February 7 5:00PM Celebrate friendship and fun for Galentine's Day! This special evening is all about honoring the amazing women in your life. Whether you’re gathering with close friends, family, or coworkers, it is the perfect chance to enjoy good company, laughter, and plenty of love. Reservation Required Register on the Invited App or with your Club Concierge at 412.391.5227

Register

Club Events

Saturday,
Feb 08
All Day

GM Reception - Coffee & Donuts

GM Reception - Donuts and Coffee Saturday, February 8 11am-12pm Stop by Arnie's and chat with Donato, our General Manager while you enjoy complimentary Donuts and Coffee.

Club Events

Sunday,
Feb 09
10:00 a.m.

Sunrise Sunday Breakfast

Sunrise Sunday Ala Carte Breakfast Menu Available from 10am-2pm Arnie's All Day Menu Available after 11am

Club Events

Sunday,
Feb 09
12:00 p.m.

Big Game To Gos

Big Game Package $175++ Each package feeds 8-10 people and includes 8 lbs. of wings (choice of 2 sauces) Chicken Quesadillas Chips & Chorizo Queso ADD ONS (Feeds 8-10 people): 8lbs Wings $125 Quesadilla $35 Chips & Chorizo Queso $30 Final Date to Order Your To-Go Package is February 6th Pick-up on Game Day February 9th between 12pm-2pm

Club Events

Sunday,
Feb 09
5:00 p.m.

The Big Game Tailgate Party

The Big Game Tailgate Party Sunday, February 9 5pm-7:30pm Join us in Arnie's all day to celebrate The Big Game! We will offer a Special Tailgate Limited Menu from 5pm-7:30pm. Arnie's All-Day Menu available from 11am-5pm.

Club Events

Tuesday,
Feb 11
6:00 p.m.

Treesdale - Ladies Night Out - Galentine's Market @ Treesdale Golf and Country Club

Ladies' Night Out - Galentine's Day Tuesday, February 11 6pm Grab a friend and stop by the Clubhouse for a one stop shop. We will have vendors from all different corners of Pittsburgh right at Treesdale. You will get the opportunity to shop Jewelry, hats, clothing, cookies, skincare, decor and so much more.

Register

Club Events

Wednesday,
Feb 12
11:00 a.m.

Eat Well Wednesdays

Join us every Wednesday for a healthy entree and specialty salad special.

Club Events

Wednesday,
Feb 12
6:30 p.m.

DJ Trivia in Ballroom

Dive into DJ Trivia We are going to continue holding DJ Trivia in the ballroom (events and space permitting) for the month of February to accommodate more teams. To enhance the experience, registration will be done through the Invited App under "Events Calendar" for each individual Wednesday. Spots are limited to ten teams and each team can have a maximum of 8 players. You can call the front desk at 724-625-2220 to reserve your spot as well. To ensure your team is ready for DJ Trivia, you MUST have registered under the event, not in the Arnie's Tavern dining space. Please include your team name in the notes section. Special Note- If you already had a reservation for upcoming nights, your reservation has automatically been transferred to the new event page.

Register

Club Events

Thursday,
Feb 13
5:00 p.m.

Taste of Italy

Join us for a New & Improved twist on a Treesdale favorite! Chef attended pasta action station with Salad Station, Assorted Pizza, Two Dinner Entrees and Dessert Station.

Dining Events

Friday,
Feb 14
2:00 p.m.

Diamond Run Golf Club - Sweetheart Dinner for 2 To-Go @ Diamond Run Golf Club

Sweetheart Dinner for 2 To-Go – A Romantic Feast at Home Celebrate love this Valentine's Day with a special, gourmet dinner for two, crafted to make your evening unforgettable. Our Sweetheart Dinner for 2 To-Go includes a thoughtfully prepared meal featuring the finest seasonal ingredients, allowing you and your special someone to indulge in a romantic dining experience from the comfort of your own home. Sweetheart Menu Includes: Pear and Romaine Salad Romaine lettuce, toasted walnuts, pears, crumbled bleu cheese, celery seed dressing Rolls with Butter Two- 8oz Filets, Demi Two- Lobster Tails, Drawn Butter Mashed Potatoes, Roasted Baby Carrots and Green Beans NY Style Cheesecake Macerated strawberries, whipped cream, mint Use the link below to place your order: Order Here!

Club Events

Friday,
Feb 14
5:30 p.m.

Treesdale Golf & Country Club - Valentine's Day Dinner @ Treesdale Golf & Country Club

Valentine's Day Dinner February 14 5:30pm MORE DETAILS TO FOLLOW

Register

Club Events

Saturday,
Feb 15
All Day

National Butterscotch Day

Celebrate National Butterscotch Day and enjoy a delicious butterscotch treat from your Friends at Treesdale!

Golf Events

Saturday,
Feb 15
All Day

Invited Couples Tournament

Invited Couples Tournament Sea Island Resort | Sea Island, GA March 2 - 6, 2025 For 96 years, The Sea Island Resort has been synonymous with world-class golf and hospitality. Meet members from around the country and enjoy the resort’s top-of-the-line facilities while competing with your mixed partner. Our Invited event entry fee includes four nights of lodging and four five rounds of golf, meals, open bars at group functions, all taxes and resort fees, and more! Registration is limited to 40 teams! Once capacity is reached, you will no longer be able to register. REGISTER NOW: https://couples25seaisland.golfgenius.com/pages/11062703186149128411

Club Events

Sunday,
Feb 16
10:00 a.m.

Sweetheart Crafternoon @ Sunrise Sunday Breakfast

Sunrise Sunday Ala Carte Breakfast Menu Available from 10am-2pm Arnie's All Day Menu Available after 11am

Club Events

Wednesday,
Feb 19
11:00 a.m.

Eat Well Wednesdays

Join us every Wednesday for a healthy entree and specialty salad special.

Club Events

Wednesday,
Feb 19
5:00 p.m.

BBQ Week

BBQ Week Wednesday, February 19 - Saturday, February 22 Enjoy Chef's delicious BBQ Feature Menu all week in celebration of National BBQ Week!

Club Events

Wednesday,
Feb 19
6:30 p.m.

DJ Trivia in Ballroom

Dive into DJ Trivia We are going to continue holding DJ Trivia in the ballroom (events and space permitting) for the month of February to accommodate more teams. To enhance the experience, registration will be done through the Invited App under "Events Calendar" for each individual Wednesday. Spots are limited to ten teams and each team can have a maximum of 8 players. You can call the front desk at 724-625-2220 to reserve your spot as well. To ensure your team is ready for DJ Trivia, you MUST have registered under the event, not in the Arnie's Tavern dining space. Please include your team name in the notes section. Special Note- If you already had a reservation for upcoming nights, your reservation has automatically been transferred to the new event page.

Register

Club Events

Thursday,
Feb 20
5:00 p.m.

BBQ Week

BBQ Week Wednesday, February 19 - Saturday, February 22 Enjoy Chef's delicious BBQ Feature Menu all week in celebration of National BBQ Week!

Club Events

Thursday,
Feb 20
5:00 p.m.

Taste of Italy

Join us for a New & Improved twist on a Treesdale favorite! Chef attended pasta action station with Salad Station, Assorted Pizza, Two Dinner Entrees and Dessert Station.

Club Events

Thursday,
Feb 20
5:30 p.m.

GM Reception

GM Reception -Happy Hour Thursday, February 20 4pm-5pm Stop by Arbor Grille and chat with Donato, our new General Manager while you enjoy complimentary hors d'oeuvres

Club Events

Friday,
Feb 21
5:00 p.m.

BBQ Week

BBQ Week Wednesday, February 19 - Saturday, February 22 Enjoy Chef's delicious BBQ Feature Menu all week in celebration of National BBQ Week!

Club Events

Friday,
Feb 21
5:00 p.m.

Fresh Catch Friday

Fresh Catch Friday *Available in Arbor Grille or Arnie's Tavern

Club Events

Friday,
Feb 21
6:00 p.m.

Bourbon Tasting

Bourbon Tasting in Arbor Grille Friday, February 21 6pm-8pm $20++ Per Person Join us in the Arbor Grille for an informal Bourbon Tasting. Sample some of the finest spirits while learning about each bourbon. Stay for dinner and enjoy our BBQ Week Dinner Features.

Register

Golf Events

Saturday,
Feb 22
9:00 a.m.

Diamond Run Golf Club - Callaway Fitting @ Diamond Run Golf Club

Swing by the Simulator building at the Driving Range to get fitted in the newest line of Callaway clubs. Call the Pro Shop to reserve a time slot.

Club Events

Saturday,
Feb 22
5:00 p.m.

BBQ Week

BBQ Week Wednesday, February 19 - Saturday, February 22 Enjoy Chef's delicious BBQ Feature Menu all week in celebration of National BBQ Week!

Club Events

Saturday,
Feb 22
6:00 p.m.

Treesdale Golf & Country Club - Spirits & Wild Game Dinner@ Treesdale Golf & Country Club

Spirits & Wild Game Dinner Saturday, February 22 6pm $110++ Per Person Chef Steven and his team have selected the finest game for this special occasion. You're in for quite a delicious and unique experience with this one.

Register

Club Events

Sunday,
Feb 23
10:00 a.m.

Sunrise Sunday Breakfast

Sunrise Sunday Ala Carte Breakfast Menu Available from 10am-2pm Arnie's All Day Menu Available after 11am

Club Events

Wednesday,
Feb 26
11:00 a.m.

Eat Well Wednesdays

Join us every Wednesday for a healthy entree and specialty salad special.

Dining Events

Wednesday,
Feb 26
6:00 p.m.

Rivers Club - Chef's Cooking Class @ Rivers Club

Chef's Cooking Class Wednesday, February 26 6:00PM Join Chef Jim for an exclusive three-course cooking class where you'll learn to create a delicious, restaurant-quality meal! Throughout the class, Chef Jim will guide you step-by-step in preparing a three-course meal that will dazzle your next dinner party guests. After the demonstrations, you'll enjoy the scrumptious dishes you've learned to prepare. Don’t miss this chance to refine your culinary skills and savor an unforgettable meal! Menu: Artisan greens and Frisee salad Port wine poached pear, Herbed Goat cheese wrapped in phyllo, Port wine vinaigrette Roast Tenderloin Champignon Robuchon Mashed Potatoes, Bouquetier of Vegetable, Pinot Noir demi-glaze Butternut Squash Panna Cotta Pickled Cranberries, Almond Crumble $65 Reservation Required Register on the Invited App or with your Club Concierge at 412.391.5227 48-hour cancellation policy is in effect.

Register

Club Events

Wednesday,
Feb 26
6:30 p.m.

DJ Trivia in Ballroom

Dive into DJ Trivia We are going to continue holding DJ Trivia in the ballroom (events and space permitting) for the month of February to accommodate more teams. To enhance the experience, registration will be done through the Invited App under "Events Calendar" for each individual Wednesday. Spots are limited to ten teams and each team can have a maximum of 8 players. You can call the front desk at 724-625-2220 to reserve your spot as well. To ensure your team is ready for DJ Trivia, you MUST have registered under the event, not in the Arnie's Tavern dining space. Please include your team name in the notes section. Special Note- If you already had a reservation for upcoming nights, your reservation has automatically been transferred to the new event page.

Register

Club Events

Thursday,
Feb 27
5:00 p.m.

Taste of Italy

Join us for a New & Improved twist on a Treesdale favorite! Chef attended pasta action station with Salad Station, Assorted Pizza, Two Dinner Entrees and Dessert Station.

Club Events

Thursday,
Feb 27
5:30 p.m.

Kid's Night Out - Seed Planting

Kid's Night Out - Seed Planting Thursday, February 25 5:30pm Bring the Kids to the Club and allow them to plant some seeds. It will be fun to watch them grow. We will then transfer them to the garden when the time is right! More Details to Follow

Register

Club Events

Thursday,
Feb 27
6:00 p.m.

Live Music in Arnie's - Brian Belonzi

Live Music in Arnie's 6pm

Club Events

Friday,
Feb 28
5:00 p.m.

Fresh Catch Friday

Fresh Catch Friday *Available in Arbor Grille or Arnie's Tavern