There are never any address posted on it. Whenever someone emails staff@nbshows.org and asks for address's I am always careful about giving out info, I always google the email to make sure its not a throw-away.
I am really excited that this topic is on HN today, because I am working on a personal project that will be at http://diyshws.org. Basically it will be a site where people can create show calendars for the small city that they live in if there is no central way to find out about shows. (other than Facebook)
1) This is a key part of the "local problem." Not all of the relevant legal context is written down or documented.
2) The power of real social connections in many ways dwarfs the power of online connection. Networks of people who know each other well and trust one another are a potent force that can even threaten the establishment. The British know this well, from the POV of the state. YC is also proof of this.
The police using email for this sort of thing actually seems like a step backwards somehow. It's been well known for a while that the B9 board gets frequented by law enforcement (both for gang and show related activities) so going the direct message route seems like an unnecessary step. You're never going to be able to adequately integrate, why even try?
On a side note, NYPD had an elaborate, illegal surveillance operation spying on Muslims in the NJ area that was outed when a building super inadvertently walked into the apartment being used as their base.