The Buddha’s Enlightenment Ceremony is one of the Three Buddha Ceremonies. The ceremony honors the full enlightenment of Shakyamuni. To commemorate this auspicious occasion, Rohatsu ozesshin 臘八大攝心 is held from December 1 to the morning of December 8. This period is treated as a single day, with no lying down permitted for the entire retreat. The Buddha’s Enlightenment Ceremony is held on the morning of December 8 immediately after the conclusion of this retreat.