Boston cops crack down on after-hours parties Saturday, July 6, 2013PrintEmail Comments (9) By: O’Ryan Johnson Boston police are using social media, as well as old-fashioned walking beats, to find huge after-hours parties before they happen in an effort to tamp down summer violence. “It’s about trying to be proactive,” said Bureau of Field Services Superintendent William Evans. “If we find out about a party, we’re going to visit that house ahead of time. If they have a DJ, they need an entertainment license. If they’re going to serve alcohol, they need a liquor license.”Evans said police are spotting upcoming parties...