^^ I saw one of the
Ginger Snaps movies on Fear.Net, too; it's the one that takes place during the Frontier Era, apparently. It was mediocre.
Let's see:
E.T. takes place around Halloween.

I think there's a vague connection in
Creepshow; I seem to remember a Jack-O-Lantern in the opening sequence. Doesn't
Monster House take place on Halloween?
I think that
Inner Sanctum set is going to move itself to the top of my list....