Okla. Stat. tit. 18, § 18-437.22: Waiver of notice

Whenever any notice is required to be given under the provisions

of this act or under the provisions of the articles of incorporation

or bylaws of a cooperative, waiver thereof in writing, signed by the

person or persons entitled to such notice, whether before or after

the time fixed for the giving of such notice, shall be deemed

equivalent to such notice. If a person or persons entitled to

notice of a meeting shall attend such meeting, such attendance shall

constitute a waiver of notice of the meeting, except in case the

attendance is for the express purpose of objecting to the

transaction of any business because the meeting shall not have been

lawfully called or convened.