Halloween International Ball

Fri.–Sat., Oct. 26–27, 9 p.m.–2 a.m.

W Hotel S.F. (181 Third St.)

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Celebrate in three separate rooms with world-renowned D.J.s and performances, costume contests, and more. Ages 21 & up. $75–$150, 415-260-9920, aykutevents.com