Results for: December 21, 2020Previous Day | Next Day December 21, 2020 Dec 21 Winter Session Instruction Begins All Day TMCC Winter Session is Dec. 21, 2020–Jan. 14, 2021. Dec 21 Last Day for 100% Refund for Winter All Day TMCC Last day for 100% refund for Winter session classes that run 12/21/20 to 1/14/21. For shorter Winter session classes, refer to refund policy. Dec 21 Last Day to Add a Winter Class All Day TMCC Last day to add a class for Winter Session.