21 years and counting since there was a dance headliner that wasn’t a last minute replacement. Weird because you’d think it’d be an obvious way of keeping the SE Corner quiet until later. Sure Fred will do it after the fallow though.
2023 is the only one I can think of. 2009 had two but Neil Young was on an Arena tour. 2010 Stevie played the MEN Arena two days after. 2011 Beyoncé wasn’t there yet. 2016 Adele wasn’t there yet. 2017 Sheeran wasn’t there yet.