Grendel has seen concerts during 17 years.

Year   Concerts Seen  
2022 2 concerts
2019 3 concerts
2018 1 concert
2017 1 concert
2012 2 concerts
2011 2 concerts
2009 1 concert
2008 1 concert
2005 1 concert
2004 1 concert
2001 1 concert
2000 1 concert
1995 1 concert
1994 2 concerts
1992 1 concert
1990 7 concerts
1989 3 concerts