There are at least three bands/performers who go by the name Callaghan.
These are photos from concerts where Callaghan played, so they may be of other bands that played the concert as well.
Katzenjammer
Cambridge Folk Festival Jul 30 - Aug 2, 2015 Cambridge, England, United Kingdom Uploaded by Craig Hatfield
Joan Baez
Shooglenifty
Joan Armatrading
The Jaywalkers
Skinny Lister
Wilko Johnson
Frank Turner
Canzoniere Grecanico Salentino
The Skatalites
C C Smugglers
De Temps Altan
Wild Willy Barrett
Passenger (Guinness Tent)
Ben Miller Band