Kangetsu Sanbutsu E (a gathering held to watch the moon and praise Buddha), 14 to 16 August depending on the lunar calendar; the Kon-do Hall is open to the public during the night and the silhouettes of the Sansonbutsu (three Buddhist deities) stand out sharply against the light.
観月讃仏会(かんげつさんぶつえ、旧暦8月14日-16日)-夜間に金堂を開扉し、堂内の三尊仏がシルエットとして浮かび上がる。 - Wikipedia日英京都関連文書対訳コーパス