Now in its third year, the Portola Music Festival has become one of the hottest tickets in town for fans of electronic and club music. For two days, Sept. 28–29, San Francisco’s Pier 80 transformed into a giant rave — if you’ll allow the expansion of the term “rave,” with its roots in underground music and culture, to include a festival put on by a major corporate promoter.

More than 30,000 attendees got decked out each day to dance and vibe beneath a glittering disco ball, taking in sets by Jessie Ware, Disclosure, M.I.A., hometown heroes Deltron 3030 and more. Photographer Estefany Gonzalez was on the scene for photos of fans and their festival fashions.