California Code, Penal Code - PEN § 26384

(a) The open carrying occurs at an auction, raffle, or similar event of a nonprofit public benefit or mutual benefit corporation, at which firearms are auctioned or otherwise sold to fund the activities of that corporation or the local chapters of that corporation.

(b) The unloaded handgun is to be auctioned or otherwise sold for that nonprofit public benefit or mutual benefit corporation.

(c) The unloaded handgun is to be delivered by a person licensed pursuant to, and operating in accordance with, Sections 26700 to 26915, inclusive.