Wow, nice! Maybe you could set up a little side gig as a holiday decorator! I've never heard of one, but they might exist, and in any case I bet there'd be a market.
I googled "holiday decorators," and they are a thing. Mostly they seem to be for Christmas, but there's no reason he can't expand his services to other holidays. Halloween has become such a Big Deal that I'd bet he'd have takers.