partier

noun

1. One who parties; a person who attends a party or other lively gathering.
2. One who takes part in "party and play" activity, combining sex and recreational drugs.

   “Almost one third of lesbians and gay men are addicted to drugs. […] I don't ascribe bad intent, but as I walk through the last stumbling, mumbling partiers at the end of gay prides, I think […]”

   “Gay circuit partiers, rave kids, and people in rural areas didn't identify themselves with the crack-using population.”