I agree with weather being a BIG factor, regardless of day-of-week. We had our biggest crowd ever last year (Monday) and it was a picture perfect night. I think that numbers could possibly even be less on a Saturday, given parties, etc. Weekdays, most parents don't have a lot planned in the evening. I dunno. If our weather forecast holds, I'm getting candy for 700 this year, and this is just based on last year's count and how many we had to turn away.
America is not at war. The military is at war. America is at the mall.