Wouldn't be a terrible idea in my opinion. There's definitely a market for people who want to get their Halloween fix, even if its just some of the food/drinks that they usually get at the event.
I'd also love to see them run a mini Mardi Gras style courtyard where they could have tents selling craft beers/small apps, sorta like a Food & Wine atmosphere, but more halloween/fall time related. I can't imagine it would be that difficult to throw together.