New bylaws may be adopted and existing bylaws may be amended or repealed at any meeting of the Board, but no such action shall be taken unless notice of the substance of such proposed adoption, amendment, or repeal shall have been given at a previous meeting or notice in writing of the substance of the proposed change shall have been served upon each member of the Board at least thirty (30) days in advance of the final vote upon such change, provided, however, that by unanimous consent of the entire membership of the Board, the requirements for such notice may be waived.