I'll probably be at home handing out sweets, but I'll be dressed up as usual!
I'm thinking one of my goddess costumes - probably Persephone, because it's the easiest to lounge around in. Long black grecian dress with gold belt, gold cloak with butterflies and flowers printed on it, and a wreath of flowers in my hair.

Ooh, although it's also NaNoWriMo-Eve, so I might get the fake blood out and dress as Clytemnestra (the star of my novel!)