Peter Pan, no. Tinkerbell - Yes! Except when there are special fireworks scheduled (New Years Eve, 4th of July, Holiday Wishes, or Hallowishes) or when there is lighting or high winds in the area, Tinkerbell flies from Cinderella Castle to Tomorrowland during the Wishes fireworks show nightly.
Yes, trick-or-treating is available to guests attending Mickey's Not So Scary Halloween Party at Magic Kingdom. The separately ticketed event is held on select dates in September and October. Guests are also encouraged to come in costume and can enjoy special activities such as rare character greetings, character dance parties, HalloWishes fireworks, and the Boo To You Parade.