Teachers from Wisconsin plan a rally Friday night at the state Capitol in Madison and on Saturday in Milwaukee to show solidarity with those on strike in Chicago.
Teachers' unions around the state were also organizing buses to head to Chicago on Saturday to participate in what is being billed as a "Wisconsin-style" rally.
Wisconsin was the center of the national fight over union rights last year when Republican Gov. Scott Walker proposed effectively ending collective bargaining rights for teachers and other public workers.
Many Wisconsin schools around the state shut down for days in February as tens of thousands of people, including many teachers, descended on the Capitol to protest Walker's proposal that passed and has been in effect for more than a year.