To me each is it's own holiday. We have decoration for Halloween that go up Oct 1st and come down Nov 1st and get replaced with our thanksgiving decorations. I love celebrating Thanksgiving with the house decked out in Fall colors and turkeys. The weekend after Thanksgiving is when we take down all the fall/thanksgiving decorations and fully decorated the outise and inside in Christmas wonder.
There are some things I will do all year when I am in mood like listening to Christmas music and watch Christmas movies. I also shop all year for Christmas gifts too.