Allen 20 has seen concerts during 14 years.

Year   Concerts Seen  
2024 8 concerts
2023 3 concerts
2022 5 concerts
2021 2 concerts
2019 1 concert
2017 1 concert
2016 1 concert
2015 2 concerts
2006 1 concert
2004 1 concert
1998 1 concert
1984 1 concert
1976 1 concert
1975 1 concert