Critical Mass celebrated its 12th anniversary on Sept. 24th, 2004 in San Francisco.

10/29/2004: Thousands of bicyclists rode through the streets of San Francisco this evening for the annual Halloween Critical Mass. The riders visited some of SF's locked-out hotels (Photos: 1 | 2). Meanwhile, the City of New York was denied a court injunction against Critical Mass (propaganda); nonetheless 33 cyclists were arrested. Rides were also busted in Oregon. Modesto critical mass rode at 5:30 p.m. Berkeley critical mass rides on the second Friday of the month. The Critical Mass Radio Network took to the airwaves, as it does nationwide on the last Friday of every month. More