J.D. Smith of the South End enjoys Salsa in the Park on a recent Monday night in front of the Blackstone Community Center. Smith said he has been coming to the popular community outdoor dance night since its inception eight years ago. The Blackstone began the programming to make the park safer and promote exercise in the summer. On any given night, the crowded dance floor sees scores of residents from all walks of life dancing and laughing. The program by MetaMovements continues through August.