Working. Whether in the morning or evening, I don't know. If I do the evening shift, we'll have a million kids in the mall getting candy from the stores. It's a safe Trick-or-Treat location. Either last year or the year before, I got to hand out candy. It was pretty fun!
If I'm at home, I'm going to do the usual stuff I do at home. My apartment's a few blocks from campus, so no kids Trick-or-Treating. Might buy candy just in case, and then eat it all later.