Amends the State Commemorative Dates Act. Provides that the name of each federal holiday and State holiday designated on a unit of local government's calendar must match the name of the federal holiday and State holiday as designated by the State. Defines "federal holiday" and "State holiday". Limits home rule powers. Amends the School Code. In a provision concerning legal holidays, requires the name of each federal and State holiday as specified in that provision to be the name of the holiday that is designated on a school district's calendar for the school term. Effective immediately.