California Code, Streets and Highways Code - SHC § 982

Except as provided in this section, the board of supervisors shall have power to temporarily close all or any part of any public highway, road, street, avenue, alley, lane or place and grant the possession and use thereof, together with the management and control thereof, to any person, firm or corporation operating, managing and controlling any exposition or fair in aid of which the granting of public moneys or other things of value has been authorized by the Constitution or laws of this State upon such terms and conditions, and for such periods of time, as the board of supervisors may determine, such possession, use, management and control to terminate not later than one year after the closing of such exposition or fair.  As to State highways, the exercise of any power granted hereby shall be subject to the approval of the department.