I saw those bad boys at the Filmore West in Frisco in 1969. (Most favorite concert ever)
Frisco is in Texas.
The Filmore West is in San Francisco, CA. Californians hate to hear “The City” called Frisco. If it is too much trouble to pronounce, or write, San Francisco, just call it “The City”. Everyone in CA will know what you mean.
Of course, in recent years, “The City” has lost a lot of its lustre. Recent, meaning the last 50.