The Sept. 19 ceremony in Los Angeles was initially due to take place indoors before a limited celebrity audience.
It added there would be further limits on the numbers of those invited to the show, including those nominated for the highest honors in U.S. television. Los Angeles last month reimposed the wearing of masks in all indoor public settings and businesses because of rising numbers of coronavirus infections in the second-largest city in the United States.
Concerns over the Delta variant of the virus on Tuesday prompted singer Stevie Nicks, 73, to cancel five concerts she had scheduled for 2021.