(From page 7 of the NWC43 Membership Guide.)
Please be sensitive to others with your costume choices. Norwescon is a family friendly convention, and genitals and nipples must be covered at all times. Skin paint or makeup that can be perceived as mimicking or mocking an ethnicity or culture that is not your own is unacceptable—this means no black face, brown face, red face, or yellow face is permitted, not even for fantasy races. Costumes that include or suggest Nazi imagery are also not permitted. And no messy or sticky costumes either—peanut butter is not a costume!