also: こうたんえ
noun
Buddha's birthday celebration; service for the Buddha's birth
Buddhist term for the ceremony or festival held on April 8th celebrating the birth of the Buddha. Also known as 灌仏会, 浴仏会, or 竜華会.
毎年四月八日には、お寺で降誕会が行われます。
Every year on April 8th, a Buddha's birthday celebration is held at the temple.
From 降誕 (birth of a noble or holy person) + 会 (gathering, meeting). The term is specifically used in a Buddhist context for the celebration of the Buddha's birth.