No Halloween in the Castro 2011

Halloween Information Sites
Safety awareness for everybody. They have released a sheet with important Safety Tips during Halloween. Download here
Meta list of Bay Area Halloween events

Haunted Bay
The classic Bay Area Halloween info site

Halloween Party Guide
Your source for local Halloween parties, events, tickets, haunted houses in San Francisco and beyond

Only in San Francisco Halloween Guide
A guide to Halloween events by the Convention and Visitors Bureau

SF Station
Halloween events for every taste

TimeOut list 

Our Night Life list