Waives written notice of a special meeting when a member submits a written waiver of notice with the clerk or secretary of the governing body at or prior to the time the meeting convenes or a member is actually present at the time the meeting convenes. A written waiver may be sent by telegram, fax, or electronic mail. In addition to existing requirements, notice of a special meeting must be: posted on an agency's website, if any; and prominently displayed at the main entrance of the agency's principal location and the meeting site if it is not held at the agency's principal location.