According to an article about the event in the Brooklyn Daily Eagle:
This event will feature arts and crafts made from found items and recyclable products as well as games and prizes. Special guests will include WNBA NY Liberty, Sandy the Seagull of the Brooklyn Cyclone and the Star Wars Costume Volunteers of the 501st Empire City Garrison and Echo Base Rebel Legion.
Free admission, $1 activities and snacks, $3 bounce house. Activities include cookie decorating, arts and crafts, carnival games and face painting.
P.S. 15 is on Sullivan and Van Brunt St.