The amount of money the city of Joliet (IL) gets from the naming rights agreement with DuPage Medical Group for the city-owned baseball stadium, home of the Joliet Slammers (Independent Professional, Frontier League), has not been disclosed, even to City Council members. City officials and council members also are concerned that the new DuPage Medical Group Field name does not take into account the Joliet Route 66 Stadium name given to the stadium by ordinance in 2017. Read more here.