From google.com

The Mid-Autumn Festival  is a popular Asian celebration of abundance and togetherness, dating back over 3,000 years to China’s Zhou Dynasty. In Malaysia and Singapore, it is also sometimes referred to as the Lantern Festival, similar in name to a different festival which falls on the fifteenth day of the Chinese New Year).

The Mid-Autumn Festival falls on the 15th day of the 8th lunar month of the Chinese calendar (usually around mid- or late-September in the Gregorian calendar), a date that parallels the Autumn Equinox of the solar calendar. This is the ideal time, when the moon is at its fullest and brightest, to celebrate the abundance of the summer’s harvest. The traditional food of this festival is the mooncake, of which there are many different varieties.
From Wikipedia, the free encyclopedia

The Moon Festival

By Su Shi