I got called out today so I couldn't make it it the track.
When I was there a week ago for a full day there were about 40 cars there. They don't actually split you into groups. The track is just open. I was worried about that, but it was never too busy. I didn't see any racing, everyone was good about waving faster cars by. They have four passing areas. I've been to lots of track days with the wife and her bike that have far more rules, that were a lot more unorganized and dangerous on the track.
I'll post when I'm headed to the track next time.