FILE - In this April 16, 2016 file photo, delegates attend a Cuban Communist Party Congress in Havana, Cuba. The VIII Congress of the Communist Party of Cuba, between April 16 and 19, 2021, could go down in history as the last with a member of the Castro family at the head, if Raul Castro fulfills his announcement to say goodbye as Secretary General.(Ismael Francisco/Cubadebate via AP File)