Cal. Health & Safety Code § 114332.2

(a) Except where all food and beverage is prepackaged, handwashing and warewashing facilities approved by the enforcement officer shall be provided for nonprofit charitable temporary food facilities. Each nonprofit charitable temporary food facility shall be equipped with a handwashing facility. Based on local environmental conditions, location, and similar factors, the local enforcement agency may, in lieu of warewashing facilities, allow a nonprofit charitable temporary food facility operating no more than four hours per day at a single event to provide an adequate supply of utensils and spare utensils when they have been properly washed and sanitized at an approved food facility and are stored and kept free of becoming soiled or contaminated.