Cal. Education Code § 49091.10

(a) All primary supplemental instructional materials and assessments, including textbooks, teacher’s manuals, films, audio and video recordings, and software shall be compiled and stored by the classroom instructor and made available promptly for inspection by a parent or guardian in a reasonable timeframe or in accordance with procedures determined by the governing board of the school district. (b) A parent or guardian has the right to observe instruction and other school activities that involve his or her child in accordance with procedures determined by the governing board of the school district to ensure the safety of pupils and school personnel and to prevent undue interference with instruction or harassment of school personnel. Reasonable accommodation of parents and guardians shall be considered by the governing board of the school district. Upon written request by the parent or guardian, school officials shall arrange for the parental observation of the requested class or classes or activities by that parent or guardian in a reasonable timeframe and in accordance with procedures determined by the governing board of the school district.