There are at least four artists called Havok: (1) an American thrash metal band ; (2) a German death metal band; (3) a Swedish extreme metal band; and (4) an underground rapper.
These are photos from concerts where Havok played, so they may be of other bands that played the concert as well.
Skeletonwitch / Havok / Mutilation Rites Nov 11, 2012 Des Moines, Iowa, United States Uploaded by Chris Kimpson
3 Inches Of Blood / Goatwhore / Angelus Apatrida / Havok May 12, 2012 Plymouth, England, United Kingdom Uploaded by Josh King
Sepultura / Death Angel / Krisiun / Havok Apr 21, 2012 Joliet, Illinois, United States Uploaded by Chris Kimpson