School Calendar. The Board shall establish and maintain within each school year an instructional calendar of no less than one hundred eighty (180) days of instruction for students from kindergarten through the twelfth (12 th) grade, exclusive of weekends, holidays, and emergency school closings authorized by the Commissioner. Source: PL 6-10, § 1 (§ 1531); repealed and reenacted by PL 20-48 § 3 (Mar. 28, 2018), modified. Commission Comment: The Commission renumbered this section pursuant to 1 CMC § 3806(a).