First car show -- advice??

Yep....the thoughtful people will tie them down, but you'll still have the ding dongs who will come in and run the little pins thru the legs and 'think' they tied it down. They are banned at a lot of shows and the promoters will refund your money and show you the gate if you argue. When I go to a Mopar show, I spend 90% of my time in the swap meet anyway. They are usually allowed there, just not in the show car areas.