I'm using a modified version of Sonya's powerpoint this week. I've changed the order around and removed a lot of the animations. I've also put in a few links to videos, though it would be smoother if they were embedded. I just don't trust having internet in my rooms, so I take the videos preloaded.
After I finish the powerpoint I have students draw or write about their own Halloween Costume and draw a Jack O' Lantern. Then I have a few share and the class pick the best one. Finally I have the kids answer the quiz and hand out candy to everyone, giving the winner of the contest an extra piece. I play the last video while I'm handing out candy.
One last note, I'm wearing my costume to classes this week, so far the kids are loving it.