The wedding rehearsal is easily the stupidest of all pre-ceremony preparations. All the wedding party does is, literally, walk in a straight line and stand still for an hour. It's the easiest fucking thing in the world. What is there to practice? There is nothing to practice.
Look, if someone is in your wedding party, they probably care about you. And, presumably, they've already attended six pre-wedding parties, four showers, and are holding tight to a rather incriminating secret about your bachelor weekend in Vancouver. Stop annoying your friends and maybe they'll keep quiet about you paying, actually paying, $20 to have a dancer squeeze a bottle of Aquafina on your face. And not from the bottle.