The 'Love Me for a Reason' hitmakers were left devastated when the 33-year-old star died suddenly in October 2009, but they still make sure he is remembered every day by speaking to him before each concert and putting a photograph of him on his old seat.
Keith Duffy said: ''We have a picture of Stephen in the quick change area where his seat would be. And we have a little group chat with him before we go on stage.''
Mikey Graham added: ''Every tour we do from here on there will be messages of Stephen.''
Ronan added to the Daily Star newspaper: ''After Steo passed a lot of us had experiences with butterflies. When we got to Doncaster there were three butterflies in the rehearsal studio fluttering around and one landed on my leg.
''It was the freakiest thing. It's like Steo was in the room, guiding us along and giving us strength.''
Take a look back at October's inaugural event.
The film is expected to continue without Mendes' involvement.