August 24 2007, midway through Prince’s stint at the O2 Arena. Almost two decades later, nobody has beaten his record 21 nights - Kevin Mazur/WireImage “I might be small, but so is dynamite,” Prince told fans at his record-breaking O2 Arena residency back in 2007. Across 21 sold-out nights through the swelter of that August and September, the Purple One – an artist in danger of being written off as a has-been at that point – brought an explosive spontaneity to London. There were no phones.