The Riptide Tavern was built in 1941, but the open mic started off in the early aughts. Looks like a good time and it goes late, so you're sure to get a slot and might even get to play more than once if you stick around.
Signup:
Walk-in, sign-up at 7pm, til close
Performance:
Two songs or ten minutes (whichever comes first), Music only
Rules:
21+ · This is a music-only open mic, so no spoken word, comedy, poetry, dramatic readings, etc (unless you put it to music). All genres, covers, and originals are accepted and encouraged
Gear:
House PA, house mics, guitar, and piano
Info:
3639 Taraval at 47th, San Francisco | (415) 681-TIDE