I'd be up for something like that. Not sure if I would get my GSS down there or not though. My local car club, Chicagoland Mopar Connection has about 800 members, and not enough go to get a club spot...
I don't think the number of people is as an important as you may think. I seen a few spots reserved for only a few cars. I think it would be great to get a couple dozen although even ten would be a good gathering.
Just so all of you know, you don't have to enter to be judged. You can enter the car in non judged and just show up and have fun. If you enter your car in advance, you will get 2 weekend passes with the entry which is the same price as 1 weekend pass by itself.