Trick or Treat here in Kentucky (at least in my region) is on the night before Halloween. (Last night)
The reason for this is that whoever decides these things thinks that too much "evilness" and "bad stuff" happens on Halloween, so they do it the night before. I think the time is from 6:00 PM - 9:00 PM.
I didnt go, but my brother did, so I get some candy.
[Edit] As for my plans for Halloween...I dont have any.
I think I'll just chill and watch Anime. And talk to whoever may be on MSN or AIM.