Carnival has been busy with cancellations.Princess has cancelled some cruises to March 2021 and some beyond
https://www.washingtonpost.com/travel/2020/08/25/cruise-lines-are-already-canceling-sailings-into-2021/
while sister Cunard has done the same
https://www.bbc.com/news/uk-england-hampshire-53904221
and here
https://finance.yahoo.com/news/carnival-shares-drop-princess-cunard-074112228.html