News Eid al-Adha 2021: When is the Muslim festival and how will it be celebrated amid COVID-19? July 19, 2021July 19, 2021Sudiksha Kochi and Jordan Culver, USA TODAYComments Off on Eid al-Adha 2021: When is the Muslim festival and how will it be celebrated amid COVID-19? Millions of Muslims worldwide will celebrate Eid al-Adha, an Islamic religious festival. In the U.S., the holiday will be celebrated on July 19.