"of madison square park with early 1800's and 1900's period-themed performances, artifacts, food + drinks, and games including badminton + croquet. free admission.weekends this month: 100 artists present works in individual rooms at the seventh annual 4 heads art fair on governors island. free.sun 12-6pm: brooklyn brain jam: enjoy several hours of entertaining, tipsy learning as the crews from the" . . . .