I know several SOHC/4 members gather in Marlinton, WV in early September every year. There is a decent place to stay there called the Jericho B&B (jericobb.com) with several cabins including one that has beds for 7 people and room for a few more who don't mind roughing it. The area has plenty of good roads which is a real bonus.
I can make it there in one long day from Lancaster County, PA; it should be fairly accessible to many folks in the SE who are willing to ride 6-7 hours to the location.