The Fillmore is a famous concert venue in San Francisco. This picture doesn't do it justice. It opened in 1912, and
by the 1950s, the literary North Beach scene had given way to the emerging Haight-Ashbury, and radical politics had a niche across the Bay at the University of California at Berkeley. The line between culture and politics is easily blurred by young people in search of adventure. (source)
Click on the image to zoom in:More, from Wikipedia:
In the mid-1960s, The Fillmore became the focal point for psychedelic music and counterculture in general, with acts such as The Grateful Dead, Quicksilver Messenger Service, Jefferson Airplane, The Doors and Janis Joplin getting their start.
Groovy. Check out this awesome old (partially burnt) photo from outside The Fillmore East: