Dress up the whole family and come to the New York Aquarium for their annual Halloween celebration. Get to know monsters of the deep, or become a sea monster yourself with a special A-scarium face painting. Dodge sea jellies at the “Alien Stingers” exhibition and keep your eyes peeled for in-your-face creatures in 4-D. Kids ages three to 12 dressed in an animal costume get in free with a paying adult. Note: this event is on weekends only. For more information, visit nyaquarium.com.