The mayor, upon his own motion, or the clerk upon the written request of three members, may convene the council at any time by notifying the members of the date, hour, place and purpose of such special meeting and by giving such additional notice as required by state law. The public shall be given at least 24 hours’ notice of any such special meeting by the posting of such notice in at least three public places and preparation of an agenda in accordance with A.R.S. § 38-431.09 as amended; except that in the case of an actual emergency, a meeting may be held upon such notice as is appropriate for the circumstances in accordance with A.R.S. § 38-431.02 as amended. A special work session may be called in the same manner and upon the same notice as otherwise set forth in this section for a special meeting of council. [Code 2004 § 2-72.]