For a party, shave your head, color your skin white and go as an Erratic nonman Ishroi. Then you have a tremendous amount of gravitas as well as a built-in excuse for whenever you make a mess or forget someone's name. If something exceedingly funny and/or traumatic happens, cry "YES! I WILL REMEMBER".
If the party is expected to get really wild, you could prepare similarly but instead go as a Sranc (preferably of the domesticated, house-broken variety).
Or, join up with two others similarly dressed, tie yourselves together tightly, get a big club and go as a Bashrag. Might be complicated when you all get drunk, though.