Actually, if the Halloween Event can be turned on and left on in selected zones rather than affecting ALL zones blueside and redside ... I'd recommend enabling Halloween as a permanent event in The Hollows and Perez Park for blueside ... and in Port Oakes and Cap Au Diable on redside (since these two zones are the two halves of the same island). That way, blueside and redside always have zones that you can go to for Trick or Treating, but they won't be zones that you stay in "forever" as you level up. Note that a permanent night in Port Oakes would enable continuous ghost spawns at Fort Darwin for the Ghost Hunter badges.