There are at least 2 bands named flag
These are photos from concerts where FLAG played, so they may be of other bands that played the concert as well.
Riot Fest 2013 Sep 13 - 15, 2013 Chicago, Illinois, United States Uploaded by Rick W
Riot Fest 2013 Sep 13 - 15, 2013 Chicago, Illinois, United States Uploaded by Tom Kennedy
Riot Fest 2013 Sep 13 - 15, 2013 Chicago, Illinois, United States Uploaded by Cory 182
FYF Festival 2013 Aug 24 - 25, 2013 Los Angeles, California, United States Uploaded by Andrewshungry
Amnesia Rockfest 2013 Jun 14 - 15, 2013 Montebello, Quebec, Canada Uploaded by Vanessa Hébert
FLAG Jun 13, 2013 Buffalo, New York, United States Uploaded by Ekoz1354
FLAG / D.R.I. / Subhumans / The Casualties May 27, 2013 Las Vegas, Nevada, United States Uploaded by Milocampo