Yeah, park next to one of the guys above
First, time, bring tire pressure gauge and the air compressor in your trunk ( usually sites have air hoses but the spare tire compressor will do in a pinch). You are likely to be spending most of the day letting air out of your tires to keep the hot psi from getting too high.
Bring something to drink and walk around and talk to the other guys.
I have had people borrow my jack, wrenches, oil, spare brake pads, and even borrow tires for 2 days at an event. I think people are pretty cool about sharing...