It's not just a show either, they actually race. Some of the guys take it easy, but usually the top 5-10 guys in each class are actually racing. Some great matchups, Ferrari GTO vs Cobra, Jag vs Mercedes, etc.
Open paddock too, so you can stick your nose all around and inside the cars. Lots of big racing names like Shelby and Gurney and Hill etc. Good place to get autographs.