There are multiple artists under this name and/or spelled U.K.: 1. a British prog rock band, 2. a Latvian folk rock band.
These are photos from concerts where UK played, so they may be of other bands that played the concert as well.
Nearfest Apocalypse / UK / Gosta Berlings Saga / Il Tempio Delle Clessidre / Mike Keneally Band Jun 24, 2012 Bethlehem, Pennsylvania, United States Uploaded by Stephenhuerta