The Mid-Autumn Festival, also known as Zhōngqiū Jié, is celebrated worldwide, particularly in China, Taiwan, Macau, Hong Kong, and Vietnam. It occurs every year on the 15th day of the 8th lunar month in the traditional Chinese calendar. This festival marks the harvest season and emphasizes themes of gathering, thanksgiving, and praying for prosperity. Key customs include family reunions, moon worship, and the sharing of mooncakes, which are round cakes filled with lotus seed paste or red bean. In Vietnam, the festival is referred to as Tết Trung Thu, or Children's Festival, and features lantern processions and lion dances, though it is not a public holiday there. The festival has a rich history and symbolizes femininity and fertility, honoring the Moon goddess Chag'e.