Cal. Civ. Code § 1742.6

Any charitable organization which conducts a sale or auction of fine art multiples shall be exempt from the disclosure requirements of this title if it posts in a conspicuous place, at the site of the sale or auction, a disclaimer of any knowledge of the information specified in Section 1744, and includes such a disclaimer in a catalogue, if any, distributed by the organization with respect to the sale or auction of fine art multiples. If a charitable organization uses or employs an art dealer to conduct a sale or auction of fine art multiples, the art dealer shall be subject to all disclosure requirements otherwise required of an art dealer under this title.