It shall be unlawful for any person who conducts or operates a business wherein food is produced, prepared, manufactured, sold, or packaged, other than a temporary establishment, in the city, to hire or permit to be hired, or permit to work gratis, any person who does not possess a current and unrevoked permit approved by the health officer. "Temporary food establishment" shall mean any food services establishment which operates at a fixed location, not to exceed two (2) weeks. (1991 Code § 11-4)