Halloween ends on November 3rd, so I don't think there will be anything left on 7th
The last day of Halloween shows and parades is the 3rd but there will be a changeover to Christmas during that week so you will still see some Halloween decor on the 4th. I love that changeover week as you go in daily wondering what is new. There are also fireworks on Lake Disney definately on the evening of the 4th and I think the 6th at park ending. Loads to do lots to see and really small queues...what's not to like! I'm there 3rd to 7th!