Carnival Cruise Line's Mardi Gras Inaugural 2020 Itineraries Now Available! Today is the day all of us Carnival Cruise fans have been waiting for. The Carnival Cruise Line’s Mardi Gras ship which is already creating buzz among cruise fans is now open for the sale of its inaugural schedule for 2020. Mardi Gras will offer a diverse schedule with six to 15-day sailings visiting top destinations throughout Europe and the Caribbean beginning in summer 2020. Guests can choose ...