Looking for large group camp area N. Ga Area

Does anyone know of an area (Primitive or not, heck it can be an empty field for all we care) for a group of RV'ers (6 - 7 RV's) and tent campers (7 - 10 couples) to gather within a 3 hour drive of the Atlanta area?

Looking for a group area for Labor Day weekend so all of our friends can go. In the years past we went to national forest camping areas (primitive) but this year we are looking to see if we could possibly find a spot for the RV's as well.