GrowNYC Halloween Costume Swap
Build It Green! NYC-Gowanus (69 9th St., Brooklyn)

Celebrate and preview the new Build It Green! NYC-Gowanus location with some fun Halloween activities including games, Halloween movies and GrowNYC’s costume swap! Find a fresh costume or donate your clean, gently-used costumes to the swap. Bring clothing, costumes and accessories only, please. Swap is free–take and give as much as you like.