It's a rather hard decision between any Rudimentary Peni show and any The Clash show, Joe Strummer is dead, so there's no chance that there will ever be another The Clash show, but Rudimentary Peni will probably never have a show again since they've had so few shows and haven't had one in an extremely long time, their most recent show was in 1992, as far as I know, despite forming in 1980.
Any Maroon 5 tour
2011 Warped Tour
taylor swift's fearless tour, and also a Maroon tour
i'd go see britney on her baby one more time, oops, and dream within a dream tour,
miley's best of both worlds tour and michael jackson's bad tour from the 80s