Amends the State Commemorative Dates Act. Provides that Juneteenth National Freedom Day shall be observed on June 19 of each year as a holiday throughout the State (currently, not a holiday and is observed on the third Saturday of June of each year). Provides that when June 19 falls on a Sunday, the following Monday shall be held and considered the holiday. Amends the Election Code, the Illinois Procurement Code, the School Code, and the Promissory Note and Bank Holiday Act to include Juneteenth National Freedom Day as a holiday. Effective immediately.