Kids sports games, family stuff, church callings, ward/youth activities, a lot of us are entrepreneurs or small business owners with business to handle on Saturday.
I think tailgating looks cool, but it’s more for a blue collar crowd who wants to knock back some cold ones on their day off. Schedule has to be clear with minimal obligations.
A lot BYU fans I know would probably say their busiest day of the week is Saturday, especially if 4-5 hours of it is going to the game.