My slight confusion over this is that a baseball bat could be a weapon but don't kids play baseball in that park? I can see why you wouldn't want to bring a firearm like an airsoft or an unsharpened katana but what about a plywood sword? Certainly less dangerous than an aluminum baseball bat but it's in the shape of a sword hehe.
Is this rule more like if it's used as a weapon in the anime, you can't bring it? I have back ups for my costume but having the weapon sort of brings out the character's trademark is all.