It was a peaceful Mother’s Day at Revere Beach this past Sunday at 6 p.m.. Waves lapped against the sand, and the sun shone down on the North Shore families who’d come out to celebrate the warm May day. Fast forward fifteen minutes, and over 100 people were brawling on the shore, according to police. First two women started fighting. Then their boyfriends’ friends joined in. And it grew from there, Revere Mayor Dan Rizzo told NECN. Soon enough, Revere Beach was so chaotic that officers from multiple departments had trouble pushing through to break it up. “It’s very...