It will be a mess on the streets of San Francisco this evening as Critical Mass flexes for a 20th Anniversary Ride, but there’s lots of other good, clean fun on the agenda for this week. We’ve collect a sample of the best free events.

free events

Corn dogs and blues at the Polk Street Blues Festival. // Photo by Mark Portillo

Fri Sep 28 – Sun Oct 21

24 Days of Central Market Arts Festival 2012

Free and open to the public, the Central Market Arts Festival features live dance, music, theater, art walks and more.

Sat Sep 29 – Sun Sep 30

The Polk Street Blues Festival

The upper Polk Street neighborhood celebrates outside with two days of blues music between Jackson Street and Pine Street.

Sat Sep 29

Balboa Skatepark Opening

The Balboa Skatepark makes its debut with live performances, food trucks and some of the best skateboarders in San Francisco.

Sun Sep 30

Sunset Fall Music Picnic: Nina Kraviz

Sunset Music hosts a party on the shores of Stafford Lake in Marin County with Nina Kraviz, Solar, J-Bird and more.