https://www.bbc.co.uk/news/entertainment-arts-48265290 Madonna's performance at the Eurovision Song Contest has been thrown into doubt by organisers, who say she has yet to sign a contract for the show. Speaking on Monday, Eurovision's executive supervisor Jon Ola Sand said: "The European Broadcasting Union has never confirmed Madonna as an act." He continued: "If we do not have a signed contract she cannot perform on our stage." The contest takes place in Tel Aviv in Israel on 18 May. Madonna's appearance was announced by her US and UK publicists in April.