Happy Mid-Autumn Festival Vietnamese from around the world. What is Mid-Autumn festival? Well there is a formal definition but it doesn’t include how the vietnamese celebrate it. The Mid-Autumn Festival (simplified Chinese: 中秋节; traditional Chinese: 中秋節; pinyin: zhōngqiū jié), also known as the Moon Festival or Mooncake Festival or Zhongqiu Festival, is a popular lunar harvest festival celebrated by Chinese and Vietnamese people. A description of the festival first appeared in Rites of Zhou, a written collection of rituals of the Western Zhou Dynasty from 3,000 years ago. The celebration became popular during the early Tang Dynasty. The festival is held on the 15th day of the eighth month in the Chinese calendar, which is in September or early October in the Gregorian calendar, close to the autumnal equinox. The Government of the People’s Republic of China listed the festival as an “intangible cultural heritage” in 2006, and it was made a Chinese public holiday in 2008. It is also a public holiday in Taiwan.