Spark up your neck bolts, dust off those wings, and fill up the fake blood banks, Halloween has arrived in San Francisco! It's time to enjoy some spooky fun in the city. Tonight, head to the Regency for some booty shaking psychedelic Cumbia with Bomba Estereo. Everyone's favorite ghost themed ship party comes to Pier 70, tickets are nearly sold out. Learn to play the Theremin for Free at Amoeba Music then transport yourself back to NYC 1977 at the Rickshaw Stop with A CBGB vs. Studio 54 Dance Party on Friday. Halloween is Saturday and we have a massive guide to parties and events, but you knew that already right? To name just a few... Groove Armada and Seth Troxler bring the party to The Midway, a Michael Jackson Zombie themed Flashmob comes to Polk Street, a live organist accompanies the silent film classic Phantom of the Opera at Grace Cathedral, and an SF couple is throwing a Halloween wedding in Dolores Park and invites the entire city. Have fun and be safe out there! Don't forget there are free cab rides from 10pm - 4am, up to $35.