Okla. Stat. tit. 18, § 18-438.11: Waiver of notice of meeting

Any person entitled to notice of a meeting may waive such notice

in writing either before or after such meeting. If any such person

shall attend such meeting, such attendance shall constitute a waiver

of notice of such meeting, unless such person participates therein

solely to object to the transaction of any business because the

meeting has not been legally called or convened.