San Francisco Mime Troupe

http://www.sfmt.org/schedule/index.shtml

4th of July Celebration (at Aquatic Park & Pier 39 & Ferry Building)

Stern Grove Music Festival

http://www.sterngrove.org/

Free Shakespeare in the Park (San Francisco Shakespeare Festival)

http://www.sfshakes.org/park/index.html

San Francisco Silent Film Festival

http://www.silentfilm.org/

San Francisco Marathon (events include full and half Marathons)

http://www.runsfm.com/

AIDS Walk San Francisco

http://www.aidswalk.net/sanfran/

Critical Mass Bike Ride (begins at east end of Market St on the last Friday of the month at about 6pm)

http://critical-mass.info/