double check all screws and bolts to make sure they're tight (but not overright). I've never played a gig as a drummer, but i have as a guitarist, and one time our drummer's bass drum beater came out mid-song.
Imagine everyone in their underwear. Especially the hotties.
Definately check out the lighting level before hand if you refer to notes, tabs or music. My night vision is horrible ...... I copy into larger font. ...!