Schaumburg police reported that, due to severe weather, Septemberfest was shut down at 8:40 p.m. Sunday.
Police said that at 9 p.m. four shelters were opened, with at least 1,000 people seeking shelter.
As of 9:45 p.m., the shelters were empty, and people were leaving the festival by bus or on foot.
According to police, there are no known injuries. As of 10 p.m., police and fire were performing a foot sweep of the area to make sure no one had remained on the grounds or suffered any injury.
Minor property damage was reported, including a couple of crafter tents and the main stage sign being blown over.