The Japanese government had decided to have a special event happen on Hallowen, a whole night without ANY laws.

Fast forward, and today is Halloween, and only in 30 minutes, the "event" starts..

Aizawa: "Everyone, keep yourselves inside, it is NOT safe outside, understood?" Bakugo: "Shut up, Teach. I'll do just whatever the fuck I want." Izuku: "Wouldn't it be best if we were out, saving people?" Mineta: "Here we are with the heroic acts again, Deku..."