On Saturday, October 21st, the world-famous Brooklyn Superhero Supply Company will open its doors to vampires, ghouls, goblins, witches, and all manner of creatures great and strange (we suspect a few superheroes, too). Test your cape on the only cape-tester in the Milky Way, and then creep behind the secret door to make monsters, write spells, and books featuring brand-new scary stories. Treats at each activity. Should you wear your costume? We’d be sad if you didn’t.