Oregon Revised Statutes Public Health and Safety § 450.070

(1) The board shall hold such meetings either in the day or evening, as may be convenient, but must hold one regular monthly meeting at a stated time and public place, at which, so far as practicable, district business shall be conducted.

(2) In case of the absence or inability of the president or secretary to act, the board may, by order entered in its minutes, choose a president pro tempore, or secretary pro tempore, or both.

(3) Special meetings may be called by the president or two members of the board by giving notice of time and place of the meeting six hours in advance.