The city, backed by Mayor Rahm Emanuel, had earlier said it would revoke National Nurses United's permit for the Daley Center protest and move the event to Grant Park after a concert by former Rage Against the Machine guitarist Tom Morello was added to the agenda, the Chicago Sun-Times reported Saturday.
But the union said late Friday the city had decided to approve the Daley Center rally after the parties agreed to reduce it from 5 hours to 2 hours with a 30-minute concert at the end, the newspaper said.
"The mayor's office and NATO backed down because we stood up," Morello said in a statement. "This is a great victory for the nurses union, the people of Chicago, free speech and rock 'n' roll."
The agreement also stipulates the rally will be a stationary event at the plaza and not include a march through downtown. The Chicago NATO summit is scheduled for May 20-21.