The carver lives here. Every night, a new jack-o'-lantern appears in front of his home. The old hermit loves visitors and always offers hot apple cider to anyone who ventures to his neck of the woods.
The real world is part of the many planes of existence in the multiverse. So technically yes. As for the popular settings used I don't think there is a helloween equivalent that is canon with pumpkins and all that. But their are festivities including costumes, or masks to scare away monsters etc.