Quick, name the craziest, gayest party you know! Provincetown Bear Week? WeHo Halloween? Taco Tuesday at Fiesta Cantina? These are all excellent guesses, but at least over the summer, they are all incorrect. On the last Sunday of each month, the epicenter of polysexual madness is located in an astroturf'd parking lot just east of the Toy District in Downtown L.A., where outrageous costumes, inflatable waterslides, and copious amounts of intoxicants (along with straight-from-the-club DJ's) combine to form the party known only as Summertramp.

[all photos via The Cobrasnake]