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Critical Mass Turns 20

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Bike parade craziness Critical Mass celebrates its 20th anniversary this year, and is celebrating this Friday in a big way. There will be bike rides, special events, and a "Welcome Center" set up at 518 Valencia all week, with a special "20th Anniversary Interstellar Critical Mass Ride" at 5:30pm on Friday. The ride starts at Justin Hermann Plaza, ends at Dolores Park around 7pm. All the festivities are listed online. [Haigheration/Photo: Colin and Sarah Northway]