Ariana Grande performed in the Manchester Arena 2 years before Manchester bombing

Which to me explains why there is footage of an Ariana Grande concert in Manchester Arena. I was previously wondering how the Arena could have been empty on the night of the bombing if there is footage of ARiana Grande performing in it, but then I found out that she appeared there on June 4th 2015 https://www.concertarchives.org/concerts/ariana-grande-push-baby-27b5468c-f9dd-4eeb-99e1-895391829835

Because 14000 or so people present during a staged hoax could be problematic. So, it is possible there was no concert. All the chaos is staged.