I have been to CumUnion parties in a few cities ... here are some brief recaps
Vancouver: Steamworks. Doesn't matter if it is CumUnion or a random Tuesday, always hot men and never see condoms used
Portland: Hawks. Hot BB crowd. Young and old playing. No attitude
Berkley: Steamworks. Line of 50+ at the door at 11pm. Huge crowd and lots of fun
San Francisco: 442 Natoma. Love the venue, but just too small of a place for me. Usually able to find some young thinks that like a daddy breeding their holes and then eating them back out, so I have fun
Los Angeles: Sanctuary private S/M venue. Love the facility except it gets too hot in some of the big playrooms. Always a huge crowd, no LA attitude, everyone plays with everyone
Palm Springs: CCBC. Typically a much older and/or Bear crowd. Cause that is Palm Springs
Las Vegas: Hawks. Had fun, but crowd was not very big and didn't really do much for me.
New York: Paddles. Fun party and good crowd. Wish the venue was a little bigger, but have had fun each time