About O-Tsukimi:

O-Tsukimi (literally, “looking at the moon”) is the practice of gazing at the harvest moon, the full moon in mid-autumn, and enjoying its beauty. In Japan, the custom of holding these celebrations is thought to have been started by aristocrats in the Heian period that lasted from the 8th to 12th centuries. Courtiers gathered for an elegant evening to admire the full moon, drink saké, recite poetry, play musical instruments, and pray for good fortune and an abundant harvest.