Curly Braces 2015 will be held at the Hyatt Regency Atlanta, in the Dunwoody and Fairlie rooms, on the Atlanta Conference Center level.
The best way to get there is to take Marta to Peachtree Center station, then up the escalator to Peachtree Center itself. Once you're inside the food court, go left at the first intersection and across the skybridge into the Hyatt.
If you drive, there are many parking decks in the area. But seriously, take the train :)