I don't know how well they're planned, but there are days where ravers come in to the parks. But, unlike the Bats Day and Gay days, the ravers are not as well behaved. I've never heard of any problems with the Goths (other than them inviting some curious stares and wondering how they can wear all the black at the end of August) or the Gays when they're there, but I know of at least one bad incident with a raver.