Have you heard about the game of Piss Poker? Folks have been playing it regularly in San Francisco for years now, and there are probably games being played elsewhere as well. You can read all about it at http://poker.pitboss.ws. The next game is set for Saturday afternoon, May 26, 2018, and you can read the details about that here.
Below are listed some venues that publicly allow and encourage piss play in designated locations and/or at specific times.
Below are listed some online resources of interest.
More to come. This is a California list only, for now.