There were more than 30 cars and 100 participants and spectators at the intersection of Sixth and Harrison streets around 2 a.m. There was the familiar sight of smoke rising into the air as cars spun and screeched their way through the streets
After breaking up that gathering, police were summoned 30 minutes later to another large sideshow at California Street and Van Ness Avenue.
That crowd was dispersed as well. No arrests were made at either location, police said.