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epa07937421 US singer Mariah Carey performs during the '1 Year to Go to The World's Greatest Show' of Expo2020 Dubai as part of Expo 2020 Dubai Global Media Briefing at Burj Park the base of the world's tallest building of Burj Khalifa in Gulf emirate of Dubai, United Arab Emirates, 20 October 2019. UAE autorrities organize a three days of Expo 2020 Dubai Global Media Briefing to show what will happen until the opeining next year. Dubai became the first Middle East city to host the global event which is supposed to open on 20 October 2020. EPA/ALI HAIDER