In the Mid-Autumn Festival, people gather together under the full moon.

Ancient emperors practiced the ritual which offered sacrifices to the sun in spring and to the moon in autumn. It's very early when the "Mid-Autumn Festival" was recorded in the "Rites of Zhou". Later on, nobles and bookmen also performed this ritual. They offered sacrifices and watched the full moon in the sky during the Mid-Autumn Festival to express their feelings. This custom then popularizes in folks. ...