The effort to keep the Castro closed for Halloween this year worked in spades...
For reference, here is a picture of last year's party...
Nine people were shot at last year's party, and a few stabbed a couple of years before that. As a result the City of San Francisco decided to cancel this years shin-dig. A huge P.R. push emphasized the fact that the Castro District's annual Halloween party was cancelled this year and urged outsiders to stay home. Some (myself included) were skeptical as to whether it would work.
Thankfully, it did.