Is Chengtian Pavilion a place where drums were played in ancient times?

Yes Gucheng Tianmen is the main entrance of Chang 'an Taiji Palace in Sui and Tang Dynasties. Built in the second year of Emperor Wendi, it was an important place for emperors and ministers to discuss and hold state affairs during the Sui and Tang Dynasties. At five o'clock in the morning, the first morning drum will be sounded on Chengtianmen, so it is the place to beat the drum. Chengtiange was built in imitation of Chengtianmen.