They join previously announced headliners Loyle Carner and LCD Soundsystem
Reserved harpist Joanna Newsom will also make a rare festival appearance
The tour will celebrate the 20th anniversary for The Postal Service's 'Give Up' and Death Cab's 'Transatlanticism'
Including tracks by The Killers and Phoenix
As she kicks off her UK and European tour, Mayberry spoke to NME about the "freedom" of writing from a purely female perspective, what to expect from her debut album, and the future of Chvrches
Ben Gibbard joined both of his bands with Death Cab performing their 2003 album ‘Transatlanticism’ and The Postal Service’s ‘Give Up’ in full
"They took our maudlin little dance track and turned it into a major key club banger," said Ben Gibbard
The Chicago festival will also welcome The Mars Volta, Turnstile, Queens Of The Stone Age, Death Cab For Cutie and more
Ben Gibbard led the band through a full crowd sing-along of the fan favourite 'I Will Follow You Into The Dark' at the closing of their UK tour
"We're auctioning this unique piece of musical history to help boost the total of our very first Make Tiny Changes Month"