Pre-game for sure, and don't show up too early. But make sure you have an "in" for crowded places with lines. If not, show up on time but still pre-game
Golden rule, no matter what happens act like you're having the most fun out of any one in the club, but don't get obnoxious. Girls gravitate to guys they think are fun first and foremost. If you look like you're bored, or to cool for school girls will think you're an ass or boring