being on the end of a (rockin'!) Halloween party, and on the eve of a season of many more parties, I thought I would write up a bit of an etiquette guide for all you party throwers and party goers out there. if you have any questions about specific issues that I don't address here, feel free to email me and I can point you in the right direction!
party goer:if the party thrower asks you to dress up, well then, by all means, dress up! your costume will (probably) make the other party goers have a good chuckle and have an extra fantastic time. It will make for outstanding pictures, and will make the party thrower feel really great about his super party.

(Rachel is a faithful adherent to this partying value and can here be seen dressed up as, and nearly indistinguishable from, the
original Gwen Stefani)
party thrower:if the party goer comes having payed no regard to the request to dress up, choose not to view this incident as a personal offense. remind yourself that party goer has indeed come, and that
that is what really matters.
party goer:when at the party, the party thrower may have put together a list of activities - - probably ones that he thinks are pretty fun. do your best to participate fully; laughing a lot, cheering other people on, and clapping others on the shoulder are all appropriate ways to communicate that you are having a grand old time participating in the organized activities.
party thrower:if you find that a particular guest is reticent to participate in the activities or just seems to be "moping around", do your best to cheerfully involve that guest - - bring him a drink and a snack, and urge him about two or three times to come live the fun life. if he refuses, avoid thinking things like "boy, what a jerk", and instead, try to think things like " man, he must have had a long day; I hope he feels better soon"
party goer:remember that, unless the party thrower has asked you to bring a specific dish, you should come without one! the party thrower has probably enjoyed putting together the menu and wants you to come without having to worry about details (other than your costume, of course)
party thrower:If a party goer shows up at your cocktail party with a bag full of hamburgers that they picked up along the way, thank the party goer profusely, remember that your guest matters more than your menu, and then chop up those hamburgers into little squares, stick little toothpicks in them, and put them on the silver tray along side of the crab cakes!
and now . . . a couple more pictures from the awesome rocker-themed Halloween party:

Joshua - - with the sweetest mohawk evahhhh

what does Cindi Lauper's baby wear? leggings and converse, of course.