California Code, Education Code - EDC § 35144

A special meeting of the governing board of a school district may be called at any time by the presiding officer of the board, or by a majority of the members thereof, by delivering personally or by mail written notice to each member of the board, and to each local newspaper of general circulation, radio, or television station requesting notice in writing. The notice shall be delivered personally or by mail 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. No other business shall be considered at those meetings by the governing board. 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 board 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 it 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 and district employees.