The Fillmore is a historic music venue in San Francisco, California, made famous by Bill Graham. Originally named the Majestic Hall, it became the "Fillmore Auditorium" in 1954 when Charles Sullivan acquired the master lease from the building owner, Harry Shiffs, and renamed it the "Fillmore Auditorium". Named for the neighborhood rather than its original location at the intersection of Fillmore Street and Geary Boulevard, it is situated in the historical center of the Western Addition neighborhood, on the edge of the Fillmore District and Upper Fillmore (lately known as Lower Pacific Heights). In the 1930s, 40s, 50s, and 60s, before redevelopment, this location was considered the heart of the San Francisco Fillmore District.
In May, 1968, several bands were scheduled to perform at the the Fillmore, including HPL. In attendance were author Howard Phillips, his wife Sonia, and two Old Ones.
HPL was able to practice in the afternoon. The Phillipses and the Old Ones watched. While Phillips found HPL's music "interesting", the Old Ones demonstrated their enjoyment by raising their wings a little.
That evening, HPL's concert was interrupted when a swarm of shoggoths disembarked from an iceberg that had floated up to San Francisco from Antarctica. The shoggoths attacked the city, destroying various artifacts pertaining to the Old Ones. One shoggoth tracked the Old Ones in the Fillmore and killed them both. It also killed Howard Phillips and at least 16 others. HPL and Sonia Phillips were able to safely evacuate to nearby Lafayette Park. During the military's attempt to contain the shoggoth invasion, the Fillmore caught fire.