Blind Date Swingers Club is a rotating club event in Berlin, that sounds very cool, and very reproducible. Everyone brings a mix tape (well, CD) of music, along with a note and contact information inside the jewel case. The music is left with the DJ. At the end of the night, everyone takes a CD that someone else made.
I love how this is a really simple idea that encourages the discovery of new people and new music. I’d love for a Bay Area version of this.