It would help if Iowa was actually ranked, but if students had plans to run home to hang out with their high school friends, the game probably is not enough to keep them in town.
Of course there will always be students like I was, that grew up on a farm and hating going home because it meant a weekend of chores. So i rarely went home when I was a student, but I know I am an exception.
Of course when I was a student there was no week long thanksgiving break. I remember for spring break, they would close the dorms and lock you out for the whole week. Do they still do that or do they leave the dorms open?