I don't think they can charge cover for a parking lot at a restraunt. From past experiences of regular meets at this place (not ricekiller meets), it's a simple show and shine. Just show up, park and mingle, just like the regular car meets at sonics, etc in various cities across the nation.
Re the meet: provided things go as planned for us, the 21st sounds good.
Is this the location you're speaking of?
http://www.mapquest.com/maps/map.adp...y=US&geodiff=1