1. Stay clear of elders. They'll want to know when you're next.
2. Stay clear of the bride and groom. Can't scold you if they don't see you.
3. Stay close to the alcohol. Anything stupid you say, you can cover up using the "I'm drunk" excuse.
4. During emergency situations, the toilet helps. Pack a good book, PSP, Nintendo DS or something you can do while sitting on the bowl.