Chūgen (中元), also Ochūgen (お中元), is an annual event in Japan on July 15, when people give gifts to their superiors and acquaintances.
One of the three days that form the sangen (三元?) of Daoism, it is sometimes considered a Zassetsu in the Japanese calendar.
Originally it was an annual event for giving gifts to the ancestral spirits. Obon (お盆?) or just Bon (盆?) is a Japanese Buddhist custom to honor the spirits of one's ancestors.
This Buddhist-Confucian custom has evolved into a family reunion holiday during which people return to ancestral family places and visit and clean their ancestors' graves, and when the spirits of ancestors are supposed to revisit the household altars.
It has been celebrated in Japan for more than 500 years and traditionally includes a dance, known as Bon-Odori.
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