Doyo no Ushi is a traditional Japanese festival that occurs during the summer solstice, typically in June. It is celebrated on the day of the Ushi (Ox) in the Doyo period, which is believed to be an auspicious time for health and well-being. The festival is associated with various customs, including eating unagi (grilled eel) to gain strength and vitality. During Doyo no Ushi, people often participate in rituals and activities aimed at warding off illness and promoting good fortune. The festival reflects the importance of seasonal changes in Japanese culture and emphasizes the connection between nature and human health.