Cal. Educ. Code § 21104

The grantor may also provide the terms and conditions upon which students in the public and private schools, and other deserving persons, may, without cost to themselves, attend the lectures of any university established, and also the terms and conditions upon which the museums, art galleries, and conservatories of music, connected with any such institution, shall be open to all deserving persons without charge, and without their becoming students of the institution.