What is the meaning of 千秋楽?

a Tang-style 雅楽 (gagaku, medieval Japanese court music) written in 盤渉調 (banshiki-chō) with no dancing

the finale of 高砂 (Takasago, a noh play), depicting a traditional Japanese wedding ceremony

the final day in a set of multi-day performances

a finale; the last or end of something

Source: wiktionary.org