In addition to a license to do business, all persons who operate restaurants or itinerant restaurants, who serve or manufacture frozen desserts, soft drinks or ice, who introduce for sale, offer for sale, sell or have in storage meat or meat products, or who operate meat or poultry packing or canning establishments, shall obtain from the Commissioner a health permit in order to carry on such business. The Department of Health may not require a person who holds a valid, annual health permit for a mobile food service to obtain additional health permits for operating a mobile food service at multiple locations during Carnival, festivals and other public events, if within at least five business days before the event, the person notifies the Department in writing, of the dates and the location of the sites at which he intends to operate. Such health permit shall be posted in a conspicuous place within the business establishment.