It's at Mid-Ohio Sports Car Course in Lexington OH. Here are links to the last few gatherings we've had:
http://www.camaro5.com/forums/showthread.php?t=181506 (2012)
http://www.camaro5.com/forums/showthread.php?t=125763 (2011)
http://www.camaro5.com/forums/showthread.php?t=71869 (2010)
The prices and schedules may change for this year, so don't pay too much attention to those, but it gives an idea of the happenings.