5 ILCS 490/63
The nineteenth day of June of each year is a holiday to be observed throughout the State and to be known as Juneteenth National Freedom Day to commemorate the abolition of slavery throughout the United States and its territories in 1865. Juneteenth National Freedom Day may be observed with suitable observances and exercises by civic groups and the public, and citizens of the State are urged to reflect on the suffering endured by early African-Americans and to celebrate the unique freedom and equality enjoyed by all State citizens today. Notwithstanding any provision of law to the contrary, when June nineteenth shall fall on a Saturday or Sunday, neither the preceding Friday nor the following Monday shall be held or considered as a paid holiday.
5 ILCS 490/63