The AROC club of Detroit is hosting a track day on October 19th at
http://www.gingermanraceway.com
$100 for non-members, plenty of track time, other Vettes will be there, Snell M90 helmet or better required.
Info and entry form available here:
http://www-personal.umich.edu/~alfa/gingerman.htm
This is a great medium speed track in the middle of a field, plenty of runoff and nothing to hit.