It is stronly recommended to personally check entry and visa requirements before making travel arrangements, as there might be country-specific conditions. For most accurate information please contact the embassy/consulate of the country where the conference will be held, in your home country.
Some information can be found here: Visa information for foreigners traveling to Brazil
To view entry restrictions and COVID-19 travel requirements for countries around the world, please visit: https://apply.joinsherpa.com/map