I saw a rumour that they would be playing posted to Reddit
There’s also been a self confirm that Shenseea who had a song with them out recently “has been asked to be there” could this be as a guest appearance for The Chainsmokers?
they've previously mentioned wanting to play Glastonbury in interviews so it seems like this may be the year.
usually just lurk on here but haven’t seen anyone put together the facts for this yet.