How about a Grand-AM race at VIR the first week of October?
http://www.grandamerican.com/events/event52.html
http://www.virclub.com/
VIR is just over the NC line.
I'd drive north from Greenville SC, unless you want to limit this just to Tar Heels
Where's everyone else coming from?
I guess I prefer ALMS to Grand-Am when it comes to sports car racing, but VIR is supposed to be a great course.

1999 Silver SE, MTX K+N, Magnecor 8mm Brullen Y-Pipe BAT struts and brakes Sony X-Plode, Cerwin-Vega Some little stuff (tint, cupholder, cargo net, etc.)