It's Bootie Mashup's annual Folsom Street Fair weekend party, with plenty of sexy mashups and fetish-tinged fun to go around. Live mashup rock band Smash-Up Derby plays their fetishy sexy set, while Bootie DJs from LA and Seattle join in on the action. Four rooms of music for one price.

Launched in 2003 by San Francisco DJ duo A Plus D, Bootie is the first and biggest mashup dance party in the world, mashing up pop songs both past and present. With its clever mashup formula, Bootie has been an unstoppable juggernaut for the past 14 years, winning numerous nightlife awards in multiple cities. Keeping one's brain guessing and body dancing with creative song combinations, it's the soundtrack for the A.D.D. generation.