The training is from 7 to 8:30 PM at Location: St Stephen's Church, 1525 Newton St NW - use the red doors on the 16th Street side.
Here's MPD's page about neighborhood watches, and here's what the organizer, NWCHCA president Cecilia Jones, has to say:
Neighborhood Watch is a recognized way for concerned community members to get involved and make a difference. This community-based organization of citizens working together with law enforcement has helped prevent burglaries, thefts, and violent crimes nationwide for many years. Ordinary people agree to look out for their neighbors and their neighbors property.On the full post on the CH listserve, Jones also talks about helping property values and things like that.