Everyone is welcome to join Mayor Marty Walsh in celebrating National Night Out in Jamaica Plain on August 5. Mayor Walsh will be joined by Boston Police Commissioner William Gross, BPD Command Staff -- and there will be free kids activities, food, entertainment, as well awards for Boston's crime watch groups. This is a free event being held at the South Street Apartments (125 South St., Metcalf Court Parking Lot) on Monday, August 5 from 4 to 8 pm. National Night Out started in 1984 by bringing civic groups, community organizations, police, residents and more together. More than 2.5 million people participated in the first National Night Out. Now more than 38 million participate annually.