Following a marathon five-hour negotiating session with a federal mediator present Tuesday, the two sides agreed on a three-year contract. Ratification votes for both sides are set for Nov. 27. CHAMPAIGN — There's little to no chance of a teachers strike at Champaign schools this year. Following a marathon five-hour negotiating session with a federal mediator present Tuesday, the Champaign Federation of Teachers and the Unit 4 school board reached a tentative agreement on a three-year contract.