TL;DR: The Mid-Autumn Festival (Tết Trung Thu) falls on the full moon of the 8th lunar month and in Vietnam is often called Tết trẻ con (Children's Festival). According to Phan Kế Bính's Việt Nam phong tục, customs include offering to ancestors during the day and setting out a tray to enjoy the moon at night with mooncakes, dyed fruits and paper toys for children. No single theory of origin is accepted by researchers; it is a layered blend of harvest festival, Chinese cultural influence and Vietnamese folk variations.
What Is the Mid-Autumn Festival and When Does It Take Place?
The Mid-Autumn Festival is the main festival of the full moon of the 8th lunar month, that is, the 15th day of the 8th lunar month, usually falling around mid-September on the solar calendar. In Vietnamese usage, this is the fullest and brightest moon of the year, tied to the Trung Thu solar term, one of the solar terms of the old calendrical cycle.
In Vietnam, the Mid-Autumn Festival is also called Tết trẻ con (Children's Festival), Tết thiếu nhi (Children's Festival), Tết trông trăng (Moon-Watching Festival) and Tết đoàn viên (Reunion Festival). These names reflect the different layers of meaning the festival has accumulated over centuries: harvest, family, children. Not all names are equally old, and not every region uses all of them.
Is There a Single Theory of the Mid-Autumn Festival's Origin?
No single theory of the Mid-Autumn Festival's origin is accepted by researchers. This point needs to be made clearly before going into the hypotheses, because popular articles often present a single origin as if it were settled.
At least three layers of explanation are commonly mentioned:
- The harvest festival layer: many agricultural cultures in East Asia have customs of offering sacrifices at harvest time, giving thanks to heaven, earth and the agricultural deity. The full moon of the 8th month marks the turn of the season in many regions, when the harvest has been stored and the weather begins to dry.
- The Chinese cultural influence layer: Chinese dynasties had the custom of moon viewing on the full moon of the 8th month quite early, and this custom spread to neighboring countries through cultural exchange, trade and migration.
- The Vietnamese folk variation layer: legends such as the story of Hằng Nga, chú Cuội, the Jade Rabbit, or the story of Emperor Đường Minh Hoàng ascending to the moon palace are all told in Vietnam, but the way they are told and the role of each character in the festival differ from China.
Assigning the Mid-Autumn Festival's origin to a specific dynasty or historical figure lacks sufficient textual evidence to conclude, and modern researchers generally do not treat these legends as proven historical events.
How Did Vietnamese People in the Past Celebrate the Mid-Autumn Festival?
According to Phan Kế Bính's Việt Nam phong tục, first printed in 1915, the Mid-Autumn Festival is the full moon of the 8th month, and the author notes that this is the occasion commonly called Tết trẻ con by folk, but many households also celebrated lavishly. During the day they prepared a tray to offer to ancestors; in the evening they set out a tray to enjoy the moon[1].
The Mid-Autumn tray as described by Phan Kế Bính included mooncakes at the head of the tray, along with many kinds of cakes, fruits and flowers dyed in green, red, white and yellow. Girls from the streets competed to carve papaya into various flowers and mold dough into shrimp and fish for display[1]. This is a noteworthy detail: the skill contest in arranging the tray existed since the early 20th century, not a product of modern festivals.
Regarding children's toys, Phan Kế Bính lists a long inventory: elephants, horses, kỳ lân (unicorn), lions, dragons, deer, shrimp and fish, butterflies, praying mantises, flower branches, trellises, đèn cù (spinning lantern), đèn xẻ rãnh (slotted lantern), communal houses and pagodas, ông nghè đất (clay scholar figurines), con thiềm thừ (toad figurines)[1]. He also notes that ten years before he wrote, that is around the early 1900s, people had begun making toys from tinplate, competing with traditional paper toys[1]. This is an early record of industrial materials entering Mid-Autumn toys.
| Mid-Autumn tray components according to Phan Kế Bính (1915) | Recorded details |
|---|---|
| Mooncakes | At the head of the tray |
| Cakes, fruits and flowers | Dyed in many colors: green, red, white, yellow |
| Carved fruits | Girls from the streets competed to carve papaya into flowers |
| Molded dough animals | Shrimp, fish |
| Paper toys | Elephants, horses, kỳ lân, lions, dragons, deer, shrimp and fish, butterflies, praying mantises, đèn cù, đèn xẻ rãnh, communal houses and pagodas, ông nghè đất, con thiềm thừ |
| Tinplate toys | Newly appeared around the early 20th century |
Why Is the Mid-Autumn Festival Called the Children's Festival?
The Mid-Autumn Festival in Vietnam is called Tết trẻ con because most of the day's activities revolve around children: toys, lanterns, masks, star lanterns and lantern parades. This name has existed at least since the early 20th century, when Phan Kế Bính wrote that folk commonly called the full moon of the 8th month Tết trẻ con[1].
The emphasis on children gives the Mid-Autumn Festival in Vietnam a different flavor from the common understanding in China, where the festival is more often associated with family reunion and adult moon viewing. However, it should be noted that both meanings exist in both places, only with different emphasis. In Vietnam, the reunion and ancestor worship parts still exist, but the children's part stands out more clearly in folk descriptions.
Is the Mid-Autumn Festival Only a Festival for Children?
No. This is a point that folk descriptions often oversimplify. According to Phan Kế Bính, during the day households still prepared a tray to offer to ancestors, and in the evening they set out a tray to enjoy the moon, meaning adults also had their ritual part and moon-viewing part[1]. He also notes that some households spent heavily on the Mid-Autumn Festival, and some toy sellers earned a few hundred silver coins on this occasion, a large sum at the time[1].
Thus, the Mid-Autumn Festival in Vietnam is a festival with many layers: the family ritual layer, the adult moon-viewing layer, and the children's play layer. Calling it the Children's Festival only emphasizes one layer, without denying the others.
Legends Associated with the Mid-Autumn Festival
Many legends are told in Vietnam on the occasion of the Mid-Autumn Festival. The most common are the story of chị Hằng and chú Cuội on the moon, the story of the Jade Rabbit pounding medicine, and the story of Emperor Đường Minh Hoàng ascending to the moon palace. These are folk legends, retold in many variants depending on the region.
These legends explain why the full moon of the 8th month is associated with the image of the moon, and why children are given lanterns, but they are not historical documents about the festival's origin. Modern research generally does not treat these legends as evidence for the date or origin of the Mid-Autumn Festival.
How Does the Mid-Autumn Festival in Vietnam Differ from China?
There are several differences commonly mentioned when comparing the Mid-Autumn Festival in Vietnam with China, but it should be noted that this is a general comparison, and both cultures have many local variations.
| Aspect | Vietnam (according to Phan Kế Bính's description and folk accounts) | China (according to common understanding) |
|---|---|---|
| Main names | Tết Trung Thu, Tết trẻ con, Tết trông trăng | Trung Thu tiết, Tết đoàn viên |
| Focus | Children, toys, lantern parades | Family reunion, moon viewing |
| Distinctive cakes | Bánh mặt trăng, bánh nướng, bánh dẻo | Mooncake |
| Prominent legends | Chú Cuội, chị Hằng | Hằng Nga, Jade Rabbit, Hậu Nghệ |
| Toys | Star lanterns, paper masks, đèn cù | Lanterns, paper toys |
This comparison table is only general, not intended to assert that any culture is original or pure. Both have borrowed from and transformed each other over centuries of exchange.
How Has the Mid-Autumn Festival Changed Today?
The Mid-Autumn Festival today has changed considerably from Phan Kế Bính's early 20th-century description. Some noteworthy points:
- The mooncake market has become a large business, with many brands and competitive designs, especially in big cities.
- Traditional paper Mid-Autumn toys are gradually being replaced by plastic toys, electronic toys and imported products.
- Lantern parades and lion dances are still maintained in many places, but the scale and form of organization vary between regions.
- The meaning of family reunion is emphasized more in modern media messages, alongside the original children's meaning.
Some places hold that the Mid-Autumn night is the brightest and most beautiful moon of the year, so moon viewing on that night brings good luck. This is a folk belief, not a conclusion of modern astronomy.
Nhật Nguyệt's Suggestion: How to Read the Mid-Autumn Festival Correctly?
When studying the Mid-Autumn Festival, one should separate three kinds of information: sourced historical records, folk legends, and cultural interpretation. Historical records such as Phan Kế Bính's Việt Nam phong tục tell us how Vietnamese people in the early 20th century celebrated the Mid-Autumn Festival[1]. Folk legends tell us what people say about the festival, but not when it began. Cultural interpretation tells us what the festival means to participants, but that is assigned meaning, not historical fact.
Nhật Nguyệt's suggestion: if you want to study the Mid-Autumn Festival in depth, read ethnographic and folklore records from various sources, compare descriptions from different regions, and note that all traditions change over time. One should not seek a single origin or a single interpretation for a festival that has existed across many centuries and cultures.
