Sunday’s Halloween Festival at Bleecker Playground featured a dangerous-looking trio of “Mortal Kombat”’s Subzero, the Grim Reaper and a stick-wielding genie type, above left. Their menace was offset by the charms of several princesses and a whiskered cat, above right. The Flying Karamazov Brothers performed songs, below, and everyone could enjoy a real hayride drawn by two humongous horses.