wow... it's crazy how different Halloween is in different states of the U.S.
Here, in Cali, trick-or-treating is always on the 31st, regardless of the day it is. If it's during the week, it starts earlier and ends earlier. Adult Halloween parties are always the weekend before... and, the weekend after is usually Dia de los Muertos stuff... San Francisco, L.A., and Oakland have huge Dia de los Muertos events, so that's usually the "go-to" events post-Halloween. (you can Google it).
And, yeah. All our stores have been draped in Halloween stuff since the 1st of September.