If you have registered, there will be a packet at the Hospitality Room for you or wherever registration is handled. In general, except for judging (where cars are parked by category) park with the other cars and take your cue off them. There should be a general parking area reserved for the cars at the hosting facility.
This is normally an informal fun thing, not like some of those other car clubs. Wether your car is a street rod of a 100+ point original, you should find that all are welcome and considered friends.