The Board of Governors shall meet at the Oklahoma Bar Center, or in such other place as it may elect, once each month at a time fixed by it and at such other times as it shall determine. Special meetings of the Board of Governors shall be held at other times, either upon the call of the Chairman or upon the call of three (3) members. Notices of special meetings shall be mailed by the Executive Director to each member, at least five days in advance of the day of meeting, unless waived in writing by a majority of the Board.