California Code, Streets and Highways Code - SHC § 26087

The commission shall select one or more polling places within the district;  shall appoint one inspector and two judges of election in each polling place, and make all necessary and proper arrangements for holding the election.  The election officers shall constitute the election board.  If no election officers are appointed by the commission, or if any of those appointed are not present at the time of the opening of the polls, the electors present may appoint substitutes to fill the election board who shall conduct the election as if they had been appointed by the commission and were present.