Mont. Code Ann. § 20-4-304
20-4-304 Attendance at instructional and professional development meetings
20-4-304 . Attendance at instructional and professional development meetings. The trustees of a school district shall close the schools of the district for the annual instructional and professional development meetings of teachers' organizations. A teacher may attend instructional and professional development meetings without loss of salary or attend other appropriate inservice training that may be prescribed by the trustees without loss of salary. If a teacher does not attend, the teacher may not be paid.