The board shall be the governing body of the district and shall meet annually on a date prescribed by the bylaws and at such other times as may be determined by the board or upon call by the chairman or any two members of the board. Vacancies on the board shall be filled for the unexpired term, and until such appointee's successor is elected and has qualified, by appointment by the remaining members of the board. The board shall adopt such rules and regulations in conformity with the provisions of the Ambulance Service Districts Act and the bylaws of the district as are deemed necessary for the conduct of the business of the district. It shall be the duty of the secretary to cause an entry to be made upon its records showing all of its minutes, decisions, and orders made pursuant to the provisions of the Ambulance Service Districts Act.