Section 307. Vacancies; Filling of Vacancies
   (a)   Vacancies. If the Council determines any of the events enumerated in provisions of the Government Code or California Constitution pertaining to vacancies in public offices have occurred, the Council shall declare a vacancy for the office of Council member or for the office of Mayor.
   (b)   Filling of Vacancies. The method of filling vacancies shall be as prescribed by ordinance.