GOVERNMENT CODE, 54956

A special meeting may be called at any time by the presiding officer of the legislative body of a local agency, or by a majority of the members of the legislative body, by delivering written notice to each member of the legislative body and to each local newspaper of general circulation and radio or television station requesting notice in writing. The notice shall be delivered personally or by any other means and shall be received at least  24 hours before the time of the meeting as specified in the notice. The call and notice shall specify the time and place of the special meeting and the business to be transacted or discussed. No other business shall be considered at these meetings by the legislative body. The written notice may be dispensed with as to any member who at or prior to the time the meeting convenes files with the clerk or secretary of the legislative body a written waiver of notice. The waiver may be given by telegram. The written notice may also be dispensed with as to any member who is actually present at the meeting at the time is convenes.

The call and notice shall be posted at least 24 hours prior to the special meeting in a location that is freely accessible to members of the public.