Mark O'hanlon has seen concerts during 19 years.

Year   Concerts Seen  
2024 1 concert
2023 3 concerts
2022 3 concerts
2021 2 concerts
2019 2 concerts
2018 2 concerts
2017 4 concerts
2016 5 concerts
2015 2 concerts
2014 1 concert
2012 1 concert
2008 1 concert
2007 1 concert
2005 4 concerts
2001 1 concert
1998 1 concert
1997 1 concert
1996 1 concert
1995 2 concerts