Nightmare On Van Ness San Francisco Halloween - #1 SF Halloween Event on October 29th 2016 (9pm-2am) at Regency Ballroom (1300 Van Ness Ave) in San Francisco, CA. For the 8th year in a row The Regency Center will be taken over as your senses indulge in absolute amazement by the most extravagant & entertaining Halloween party in San Francisco thus far. Decked out in Halloween decorations, the 100-year-old art deco Regency Ballroom will feature sexy go-go dancers, state-of-the-art light and sound production, a costume contest w/ cash prize & other fun surprises throughout the night. Enjoy three levels of nonstop Top 40, hip-hop & electro from seven all-star DJs. Costumes are required for everyone in attendance, so make sure to wear your sexy-scary best!