California Code, Penal Code - PEN § 602.6

Every person who enters or remains in, or upon, any state, county, district, or citrus fruit fair buildings or grounds, when the buildings or grounds are not open to the general public, after having been ordered or directed by a peace officer or a fair manager to leave the building or grounds and when the order or direction to leave is issued after determination that the person has no apparent lawful business or other legitimate reason for remaining on the property, and fails to identify himself or herself and account for his or her presence, is guilty of a misdemeanor.