Michigan State confirmed the alteration after ESPN first reported the date change.
Grunkemeyer is the first quarterback to join Penn State's recruiting Class of 2024.
Lee joins the Bulldogs with two years of eligibility remaining.
Collins spent just one year with Mississippi State before transferring and didn't register an appearance during that time.
With only 110 days left before the Nittany Lions' season opener against West Virginia, Penn State announced themes for all seven of its home games on Monday.
This will mark Iowa's second White Out appearance in Beaver Stadium and its first since 2009. The game will kickoff at 8 p.m. and be broadcast on CBS.