Cal. Penal Code § 27210

(a) The producer and facility’s manager of a gun show or event shall prepare an annual event and security plan and schedule that shall include, at a minimum, the following information for each show or event: (1) The type of show or event, including, but not limited to, antique or general firearms and ammunition. (2) The estimated number of vendors offering firearms or ammunition for sale or display. (3) The estimated number of attendees. (4) The number of entrances and exits at the gun show or event site. (5) The location, dates, and times of the show or event. (6) The contact person and telephone number for both the producer and the facility. (7) The number of sworn peace officers employed by the producer or the facility’s manager who will be present at the show or event. (8) The number of nonsworn security personnel employed by the producer or the facility’s manager who will be present at the show or event. (b) The annual event and security plan shall be submitted by either the producer or the facility’s manager to the Department of Justice and the law enforcement agency with jurisdiction over the facility. (c) If significant changes have been made since the annual plan was submitted, the producer shall, not later than 15 days before commencement of the gun show or event, submit to the department, the law enforcement agency with jurisdiction over the facility site, and the facility’s manager, a revised event and security plan, including a revised list of vendors that the producer knows, or reasonably should know, will be renting tables, space, or otherwise participating in the gun show or event. (d) The event and security plan shall be approved by the facility’s manager before the event or show, after consultation with the law enforcement agency with jurisdiction over the facility. (e) A gun show or event shall not commence unless the requirements of subdivisions (b), (c), and (d) are met.