1pm-4pm, free, Coney Island USA, 1208 Surf Ave, Brooklyn, coneyisland.com/programs/mermaid-parade. Now in its 37th year, this is the largest art parade in the nation, celebrating ancient mythology as well as honky-tonk rituals of the seaside. Thousands of creative folks are expected to join in this festival of art, fashion, semi-nudity, individual spirit and community pride!