Haunted W Hotel SF -- 5th Annual Haunted Hotel W SF Halloween Party on October 29th 2016 (Saturday) 9:00pm - 2:00am at W San Francisco, 181 3rd St, San Francisco, CA 94103. Who’s looking for the hottest Halloween haunt? Embrace your alter ego, don your most stylish costume and head to W San Francisco’s “sinister chic” Halloween Happening. W San Francisco turns into a hotel-wide haunted house, featuring San Francisco’s hottest deejays spinning Top 40, Hip Hop, EDM and more. Put on your most creative costume and head to the W San Francisco to party all night.