Gruebs has seen concerts during 14 years.

Year   Concerts Seen  
2021 6 concerts
2020 1 concert
2019 5 concerts
2018 2 concerts
2017 1 concert
2016 3 concerts
2015 4 concerts
2014 5 concerts
2013 2 concerts
2012 2 concerts
2011 1 concert
2009 1 concert
2007 1 concert
2005 1 concert