There are, at least, three bands named Katzenjammer:
These are photos from concerts where Katzenjammer played, so they may be of other bands that played the concert as well.
De Temps Altan
Cambridge Folk Festival Jul 30 - Aug 2, 2015 Cambridge, England, United Kingdom Uploaded by Craig Hatfield
Wild Willy Barrett
Cambridge Folk Festival Jul 28 - 31, 2011 Cambridge, England, United Kingdom Uploaded by Craig Hatfield
Admiral Fallow
Hobo Jones
Glastonbury Festival 2011 Jun 22 - 26, 2011 Shepton Mallet, England, United Kingdom Uploaded by A Badger Faced Man
Highfield Festival 2009 Aug 21 - 23, 2009 Erfurt, Thuringia, Germany Uploaded by Grinsplinsen