A teacher, being a member of the Manitoba Teachers' Society executive committee or any of the executive committees, or any branch thereof or of any special committee of the Society, or being appointed an official representative or delegate of the Society, or any branch thereof, and being authorized by the Executive Committee of the Society to attend a meeting of the committee of which he/she is a member, or to act as a representative or delegate of the Society of any branch of the Society in a matter of Society business requiring absence from school, shall have the right to attend such meetings or to act as such representative or delegate and shall be excused from school duties for either purpose or both purposes for not more than a total of five (5) teaching days in any school year. The Division Board shall be notified on each occasion that a teacher makes use of this privilege. The Board shall pay a substitute and be reimbursed for providing the substitute.