California Code, Education Code - EDC § 37220.5

(a) In addition to the holidays prescribed in Section 37220, public schools may be closed on March 31, known as “Cesar Chavez Day,” or the appropriate Monday or Friday following or preceding that date, if the governing board, pursuant to a memorandum of understanding reached pursuant to Chapter 10.7 (commencing with Section 3540) of Division 4 of Title 1 of the Government Code, agrees to close schools for that purpose.

(b) On March 31 or on the day determined by the governing board, public schools and educational institutions throughout the state may include exercises, funded through existing resources, commemorating and directing attention to the history of the farm labor movement in the United States and particularly the role therein of Cesar Chavez.  The State Board of Education shall adopt a model curriculum guide to be available for use by public schools for exercises related to Cesar Chavez Day.