So we improvised and parked at another friend's house and trick or treated in their neighborhood.
It took Marshall awhile to get it. He completely walked in to the first 5 houses. Whoops. Finally he got the hang of it, but since he's never had candy he didn't understand what people were putting in his bag:)
Towards the end of the night we let him have 2 suckers and he was in little boy heaven. He kept saying "oh candy, it's sooooo yummy!"