The Mid-Autumn Festival (中秋节, Zhōngqiū Jié) falls on the 15th day of the 8th lunar month, when the moon is fullest. Families gather to eat mooncakes (月饼) and admire the moon.
history
The character 秋 originally depicted grain (禾) next to fire (火), representing the harvest season when fields were burned after the autumn harvest.