From SFBC :
Join the San Francisco Bicycle Coalition for a ballyhoo of bikes and beer at the fun-filled day in the park sponsored by our generous friends at the New Belgium Brewing Company. All proceeds from beer and merchandise at Tour de Fat  go to the work of the SF Bicycle Coalition and Bay Area Ridge Trail Council.
Spread the word about the Bike Parade, Revivalation, Performances, and Car-for-Bike Swap, join our Event Page 
This event is free and of course complimentary valet bicycle parking will be provided by the SF Bicycle Coalition. To volunteer to valet park bikes please contact Tyler at firstname.lastname@example.org . To be part of the fun folly as a volunteer, and earn a free t-shirt, go to Volunteer Sign Up