The event marks anniversary of October 1, 1949, announcement of the founding of the People's Republic of China by then-leader Mao Zedong.
Family members continue to call for justice 5 years after students were allegedly taken by local police and turned over to a drug gang.
It is being called as the world's biggest airport and the event was attended by Xi Jinping.
The royal couple are on the third day of their African tour.