I took an informal poll of my LDS acquaintances. 100% of them trick-or-treated on Saturday and had candy ready for trick-or-treaters on both Saturday and Sunday. No one I polled commented about the morality of Sabbath day trick-or-treating. All of them responded that they had very few trick-or-treaters on Sunday.

However, my out-of-state LDS acquaintances seem to have all trick-or-treated on Sunday.

I'm curious if my findings are common to others as well.