Thanksgiving and Halloween are really quite similar, you know. I mean, they’re practically on top of each other when it comes to the calendar, they’re both bursting with your standard fall color scheme, and while you worship the devil during one, the other has you paying homage to a wad of congealed berry juice (practically the same thing).
I think combining the two would definitely save time. Who needs to spend hours cooking a full turkey dinner when you can just go collect some candy? Though I guess one drawback would be the name, since it would most likely come out sounding like “hollowgiving”, which might make some people doubt the sincerity of the love and thought behind the candy and bits of deli meat being tossed into their sacks.