Atlanta Symphony

Atlanta Opera

Alliance Theatre

Fernbank IMAX Martini night (every Friday)

Blakes on the Park
Gay, next door to Outwrite Bookstore

Apres Diem
This cafe'/coffee house in the Restaurants' listing as well. Great place for people watching & good food.

Leopard Lounge

More Ideas:
Check Creative Loafing, Atlanta and SOVO for more entertainment options, musical performances, theatre and dance.