The board of supervisors of any county owning or operating any public park or recreation area, shall have authority: (a) to lease, let or grant licenses for the use of its real estate or personal property or any portion thereof for any agricultural, horticultural, viticultural or livestock fairs or expositions, rodeos, floral displays, dog and cat shows, exhibitions of industries and industrial products or federal or state armories; to school organizations or associations thereof for the purpose of conducting athletic events participated in by such schools or associations or to civic, patriotic, benevolent, or fraternal corporations or associations, for the purpose of holding conventions, assemblies or public meetings on subjects of public or community interest; or for the sale of tangible personal property, or for concessions and services incidental to any of such purposes; or to any person, firm or corporation for concessions and services consistent with public park and recreation purposes; or to nonprofit athletic organizations for athletic activities or to nonprofit fair associations or to nonprofit agricultural associations or to municipal corporations for use or reletting for any or all of the foregoing purposes; (b) to rent or permit the use of its premises for the holding of sales or auctions of cattle or other livestock or for other purposes beneficial to the agricultural industry.