(a) Unless the certificate of incorporation or bylaws provide otherwise, regular meetings of the board of directors may be held without notice of the date, time, place or purpose of the meeting, except that, unless stated in a written notice of the meeting, no bylaw may be brought up for adoption, amendment or repeal.
(b) Unless the certificate of incorporation or bylaws provide for a longer or shorter period, special meetings of the board of directors shall be preceded by at least two days' notice of the date, time and place of the meeting. Unless sections 33-1000 to 33-1290 , inclusive, the certificate of incorporation or bylaws require otherwise, notice of a special meeting need not include a description of the purpose or purposes for which the meeting is called, except that, unless stated in a written notice of the meeting, no bylaw may be brought up for adoption, amendment or repeal.