They either do 1 super secret scrimmage off campus or 2 open ones but Iowa typically plays KS, KST, CREIGHTON, MIZZOU, UNO somewhere near Omaha every year. They don't really keep scores and they practice situational moments at points during the scrimmage. Like, it may be a 20 minute half but they might spend half of that time just working on out of bound plays.
Weirdly enough, there is a rumor in Omaha media that Jay Higgins (CBB Ref who lives in Omaha) ejected Fran from a super secret scrimmage which makes me laugh even as I'm typing this. I love that Fran would be upset in a scrimmage that didn't count but that's just me.
Anyways, we typically hear how it went and that's typically some message board skuttlebutt heading into the week before the season opener. I think last year ISU and Creighton played and the word was that ISU waxed em so they came into the season thinking they were pretty good.