California Code, Business and Professions Code - BPC § 5016

A majority of the board shall constitute a quorum for the transaction of any business at any meeting of the board.  Notice of each meeting of the board shall be given in accordance with the Bagley-Keene Open Meeting Act (Article 9 (commencing with Section 11120) of Chapter 1 of Part 1 of Division 3 of Title 2 of the Government Code).  The board shall meet at the call of the president and executive officer, but not less than twice each year.  Any two members of the board may request the executive officer to call a special meeting, and the executive officer, upon receiving that notice, shall call a meeting pursuant to the procedure prescribed herein.