Children perform during a rehearsal of the Beijing 2022 opening ceremony at the National Stadium in Beijing on Saturday night. About 4,000 participants were involved in the all-factor rehearsal, preparing for the opening ceremony to be held Feb. 4. Zhang Yimou, who directed the Beijing 2008 opening and closing ceremonies, is to become the first man to direct the ceremonies of both Summer and Winter Games as Beijing makes history as the first “dual Olympic city.” Xinhua