Iowa Code § 490.823: Waiver of notice.

1. A director may waive any notice required by this chapter, the articles of incorporation, or the bylaws before or after the date and time stated in the notice. Except as provided by subsection 2, the waiver must be in writing, signed by the director entitled to the notice, and delivered to the corporation for filing by the corporation with the minutes or corporate records.

2. A director’s attendance at or participation in a meeting waives any required notice to the director of the meeting unless all of the following apply:

a. The director at the beginning of the meeting, or promptly upon arrival, objects to holding the meeting or transacting business at the meeting.

b. The director does not, after objecting, vote for or assent to action taken at the meeting.