Fat Thursday
In North America, particularly the large Polish communities of Chicago, Detroit, and other large cities across the Midwest and Northeast, Paczki Day is celebrated annually by immigrants and locals alike. The date of this observance merges with that of pre-Lenten traditions of other immigrants ("e.g.", Pancake Day, "Mardi Gras") on Fat Tuesday. With its sizable Polish population, Chicago celebrates the festival on both Fat Thursday and Fat Tuesday. "Pączki" are also often eaten on Casimir Pulaski Day. In Buffalo, Toledo, Cleveland, Detroit, Grand Rapids, Milwaukee, St.Louis, South Bend, Louisville, and Windsor, Pączki Day is celebrated on Fat Tuesday.