At this time, the only after-party happening every day is at B52, starting at 6am. It's not designated as a gay venue but rather gay-friendly. Since it is the only after-party spot open, it is visited by many gays. (there is even a dark room).
The alternative is to open Grindr or Scruff at 4-5-6am and find a "chill" (spontaneous private parties/sex parties) or organize your own...