Dragon Con is an annual multi-genre Sci-Fi and Fantasy convention held in Atlanta over Labor Day Weekend. Dragon Con started in 1987 as an outgrowth of a local SF and gaming group, the Dragon Alliance of Gamers and Role-Players. Over the years, the convention has grown to cover more than just Science Fiction, Fantasy, and gaming. It covers 5 hotels and had more than 80,000 visitors last year.
There are a ridiculous number of things to do at Dragon Con. Tabletop Gaming is extensive at the convention. They have their own online game registration system at http://gaming.dragoncon.org/.