5 ILCS 490/15: Casimir Pulaski Holiday.

The first Monday in March of each year is a holiday to be observed throughout the State and to be known as the birthday of Casimir Pulaski. Within 10 days before the first Monday in March of each year, the Governor shall issue a proclamation announcing the holiday and designating the official events that shall be held in honor of the memory of Casimir Pulaski and his contribution to American independence.