2015 ORS § 65.217¹
Waiver of notice

(1) A member may at any time waive any notice required by this chapter, the articles or bylaws. The waiver must be in writing, be signed by the member entitled to the notice and be delivered to the corporation for inclusion in the minutes or filing with the corporate records.

(2) A members attendance at a meeting waives objection to:

(a) Lack of notice or defective notice of the meeting, unless the member at the beginning of the meeting objects to holding the meeting or transacting business at the meeting; and

(b) Consideration of a particular matter at the meeting that is not within the purpose or purposes described in the meeting notice, unless the member objects to considering the matter when it is presented. [1989 c.1010 §57]