California Code, Penal Code - PEN § 25510

(a) The possession of a firearm by an authorized participant in a motion picture, television, or video production, or an entertainment event, when the participant lawfully uses the firearm as part of that production or event, or while going directly to, or coming directly from, that production or event.

(b) The transportation of a firearm by an authorized employee or agent of a supplier of firearms when going directly to, or coming directly from, a motion picture, television, or video production, or an entertainment event, for the purpose of providing that firearm to an authorized participant to lawfully use as a part of that production or event.