Front Page News in Midtown has a bloody Mary bar for brunch and is a Tiger Bar. Ya'll will be welcomed there.
Sunday Night: take your group to the Virginia Highlands (great bars, mixed crowd). I suggest Fontanne’s for dinner. It's not too pricy and has great sea food and drink specials.
Vortex in Little Five Points or Midtown has the best burger when you're hung-over before you leave on Tuesday.
Things to do on Sunday, Monday before: Coca Cola Museum, GA Aquarium, CNN Tour, Cheetah Strip Club, bar hopping in Buckhead (suggest East Andrews, Red Door, Buckhead Saloon and Kramers) etc.