Looks like grilling in the ramps is not permitted:
Wood Fires Not Permitted
Open wood fires or wood fires enclosed in portable pits are not permitted. LP and charcoal grills and LP heaters, when temperatures warrant, are permitted in parking lots but are prohibited in parking ramps. Charcoal must be disposed of in designated containers located throughout parking lots. Please do not place used charcoal, embers, or ash in trash cans, under trees or leave it in the parking areas. LP grills or heaters are limited to 1-20# LP cylinder per device; no spare or additional cylinders will be allowed.
Barbeque Grills
Grills of any kind are prohibited in UI parking ramps.
Looks like beer and wine is permitted but leave your bottle of Templeton at home.
TAILGATING
Alcohol Policy
Policy: Tailgating that includes the responsible and lawful use of alcohol is permitted within the parameters determined by law and University rules and protocols.
Fans tailgating Friday nights on public property are reminded that the possession of an open container of beer, wine or consumption of hard liquor is prohibited by law. Law enforcement officers will ask fans to empty the container of issue a citation if the situation warrants.
On Saturday football game days only, beer and wine are allowed in UI parking areas, except the alcohol-free lot 14 at the corner of Melrose and South Grand Avenues. Patrons and ticket holders are advised that state law prohibits hard liquor consumption of possession of an opened bottle of hard liquor on public property, which includes university parking lots and ramps. Law enforcement will empty any opened, visible bottle of hard liquor and may issue a citation if the situation warrants.
Here is a link to lot of tailgating and parking rules:
IOWA OFFICIAL ATHLETIC SITE - Gameday