“Critical Mass is a mass bicycle ride that takes place on the last Friday of each month in cities around the world. Everyone is invited! No one is in charge! Bring your bike!”
The unofficial critical mass site: sfcriticalmass.org
“Before bikes were invented, the popular Wiggle bike route was a foot trail to avoid these same hills. Change the way you see the landscape as we talk about everything from art and bike politics to floods, lakes and native societies. We’ll discuss the very latest research on how the Mission Dolores was, it seems, founded in the Wiggle.”
RSVP required. Set your own cost: $10 to $40 donation asked.
+info via thinkwalks.org here: link