From SF Bicycle Coalition:

San Francisco hosts one of the biggest Bike to Work events in the country.
Join the fun! It’s the 21st Anniversary of San Francisco’s Bike to Work Day and we will be celebrating Bike Month all of May.
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A traffic sewer transformed into liveable streets thanks to the hard work of advocates and dedicated city officials
Transit advocate, bike advocate, former BART director, El Cerrito City Council... Bike East Bay's new leader has done some of everything in the world of safe and livable streets