Remember to follow the other rules you've learned for interacting with gay people, since there will be a few there. Remember, also, that is event is about them, and not you, and that for the time being you are the guest of another culture. Enjoy your time there, but respect the fact that your attendance is not a Specially Commendable Proof of Your Tolerance, Magnanimity And All-Around Coolness, but simply an expression of affection for your friends to which they are entitled. We're not talking about hygiene here. We're talking about that interesting tradition in American culture whereby once you annoucne your intention to marry your friends feel they must run out and buy you presents and then fling them at you during a string of ritualized theme parties.
Nothing pisses a queer person off more than having to attend a wedding shower.
OK, there's some hyperbole in there. Being set upon and beaten up in the streets pisses us off more. Jesse Helms's continued existence on this planet pisses us off more. Bow ye down before her and offer tribute. Not only does this heterosexual person get prizes just for falling in love with someone, but their queer friends now have to actually pay to be oppressed.