Critical Mass: 20th Anniversary
To mark the 20th Anniversary of the first Critical Mass ride, there is a week-long celebration September 23-30, 2012 of bike rides, art exhibits, movie screenings, and bike carnivals capped off with the big birthday on Friday September 28th – the Interstellar Critical Mass ride, which will be a giant, crazy, awesome evening ending in a big party under warm skies.
Critical Mass 20th Anniversary Bike Celebration
September 23- 30, 2012
All Over San Francisco
The History of Critical Mass: On the last Friday of September, 1992, a group of San Franciscan cyclists showed up on Market Street for the first ever Critical Mass – a leaderless ride that became a monthly “organized coincidence” and spread around the world.