An ancestor worship ceremony is held at Tianjing Palace to commemorate Laozi, one of China's most celebrated philosophers who lived during the Spring and Autumn Period (770-476 BC), at his birthplace in Guoyang county of Bozhou city, East China's Anhui province, March 26, 2017. [Photo by Liu Qinli/Aasianewsphoto]

Dressed in traditional Han clothing, hundreds of Taoists pay respect to Laozi, the founder of Taoism.

The ceremony also marks the start of the Seminar on Laozi and Taoism Culture, which is attended by more than 1,000 scholars and Taoists from both China and abroad.