Go to a website where you get to see video snippets and still photos of every kind of costume - from cute to clever and everything in between. Much higher quality and much more rapid than waiting for the door bell to ring. Lots could be done with this. (Thumbs up or thumbs down gradually tailors pictures offered.)
Then, periodically, you have to hit a "donate" button that puts money into a fund for impoverished kids. Your equivalent of handing out candy, but in this case it'd be a mix of carbs, protein, and fats to needy kids.