Coronavirus: Rio 2021 carnival parade postponed indefinitely - BBC News

Organisers say they are not yet certain enough to provide a new date for the carnival parade.

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2020s - Wikipedia

Rio cancels Carnival street parades, parties for 2nd year as Omicron surges in Brazil - National

Rio postpones Carnival over COVID-19 – DW – 09/25/2020

Rio's Annual Carnival Parade Suspended Due to COVID-19

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Rio de Janeiro's dazzling Carnival parade resumes after COVID-19 pandemic hiatus - ABC News

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Brazil BnB

Rio Carnival - BBC News