Y-Untitled Monster Mash is a 21+ costume party at Game room in Brooklyn, NY, on Saturday, October 24 from 8 PM to 2 PM. That's one week before Halloween, and it is listed as free to attend. Costumes are part of the fun. Guests must be 21 or older. Brooklyn has 24 other Halloween events within three days of this one.
Saturday, October 24 · 8 PM – 2 PM
UTC-04:00Game room | Brooklyn, NY
Game room, 1300 Flatbush Ave, Brooklyn, United States
Y-UNTITLED
It is on Saturday, October 24, 2026, from 8 PM to 2 PM, one week before Halloween.
It takes place at Game room, 1300 Flatbush Ave, Brooklyn, United States.
Yes, it is listed as free to attend. Check the event details in case registration is required.
Yes. The listing says guests must be 21 or older.
Yes, costumes are encouraged.
It runs for about 18 hours, from 8 PM to 2 PM.
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