20-1-303. Conduct of school on Saturday or Sunday prohibited -- exceptions. (1) Except as provided in subsections (2) and (3), pupil instruction may not be conducted on Saturday or Sunday.

(2) In emergencies, pupil instruction may be conducted on a Saturday when it is approved by the trustees of the school district in accordance with the policies adopted by the board of public education.

(3) Pupil instruction may be held on a Saturday at the discretion of a school district for the purpose of providing additional pupil instruction, provided that:

(a) Saturday school is not a pupil-instruction day and does not count toward minimum aggregate hours of pupil instruction provided for in 20-1-301; and

(b) student attendance is voluntary.