closing day of a show; final performance day
Used in theater, sumo, and other staged events for the last day of a run. Often contrasted with 千秋楽, which specifically refers to the final day of a sumo tournament or the last performance of a long-running show.
See also: 千秋楽 (せんしゅうらく)
Today is the closing day of the performance run.
楽日には特別なカーテンコールがあった。
There was a special curtain call on the final day.
Formed from 楽, an abbreviation of 千秋楽 referring to the final performance of a run, and 日 “day.”