I did this may years ago. They provided us with good hard standing for the showing of the cars and then we did a parade lap with one of the Ascar drivers hanging out the t-top waving to his adoring fans!!!
After the parade lap we had one fast lap behind a pace car and then a some fun with the exhaust apprieciation tunnel. A good day out but overshadowed by one of the cars on display having their valve caps stolen. Minor maybe, but still not pleasant when it happens to you.
Also, a long day. They wanted all the cars in long before gates opened to the public so i think we had a 4am leave that morning!!