Performers dance during the traditional "Anzhaonadun" festival, at Minhe Hui and Tu autonomous county in Haidong city, Northwest China's Qinghai province, Aug 25, 2015. The traditional "Anzhaonadun", which means "hearty entertainment" in Tu language, is an annual carnival observed by the Tu people to honor the year's crop production. This 63-day-long festival, dubbed as the "World's Longest Carnival", kicked off here Tuesday.