School Calendar Section 1 - Work Schedules. 18.1.1 A general school program calendar can be found in Article 25. Any necessary changes due to legal requirements or for other reasons shall be jointly developed by the parties. By June 1 of each year, prior to the development of the upcoming school program calendar(s), Administration shall meet with Unit II leadership to review the proposed calendar(s). These calendar(s) will establish a set schedule for opening day, which is not the first day of instruction for students, and for the week prior to the start of the instructional year for students.