Exactly. Either crotch it or put minis in your socks.
According to the Michigan Daily, here are the Big Ten schools and their policy on alcohol in stadiums. NONE of them have alcohol for the general public, and only the ones listed with a "yes" allow alcohol in suites.
Which stadiums allow alcohol?
MSU - Yes
Illinois - No
Ohio State - No
Purdue - Yes
Northwestern - No
Wisconsin - Yes
Iowa - Yes
Minnesota - Yes
Penn State - Yes
Indiana - No
Michigan - No