Critical Mass is a mass bicycle ride that takes place on the last Friday of each month in San Francisco starting at 5:30 pm at Justin Herman Plaza (foot of Market Street) and in cities around the world. Everyone is invited. No one is in charge. Bring your ...Monthly

Critical Mass is a mass bicycle ride that takes place on the last Friday of each month in San Francisco starting at 5:30 pm at Justin Herman Plaza (foot of Market Street) and in cities around the world. Everyone is invited. No one is in charge. Bring your ...Monthly

Enjoy an hour-long walk on the rise, tragic fall, and modern rebirth of one of San Francisco’s most renowned historic landmarks. Visit a contemporary swirl of shops and learn the history of ferries, freeways, and quakes. Meet at the foot of the stairs at the ...Every Tuesday