Just using our situation as an example.....It's easier to re-book officials, security, concession stand workers, gate workers, etc....The other thing is, some kids and coaches already have plans to go to college games on Saturdays. Last thing, when you play on a school day, for the most part, you know where your kids are and what they've been doing.....If you play on a Saturday night, you either have to bring them in early and baby sit them all day, or you trust that they will get to the field house in a timely manner with the proper rest, nutrition, and no extra performance inhibiting substances in their system.