Eh, apparently they like to be in the spot-light. Otherwise they wouldn't be doing stupid things like that for extra attention. I've had pretty good luck in the past by just simply asking, "hey, we're already testing our luck by being here. would you mind not revving your engine when you come in/out or turn your music down please?". Unless someone is a complete dick, they've always seemed to help out. If nothing less, the second the cops come into the parking lot walk up to their car and point out the guy who's causing issues. "Yes sir, this car here was coming into the parking lot revving his motor extremely loud and doing burn-outs. As well, that car over there has had his music turned up very loud for the past 30 minutes and will not turn it down no matter how many times we've asked."
I mean, whats the worst that will happen. The cop says, "okay, everyone has to go." The way I think about it, he was there to kick everyone out anyways.