final performance; last performance
Used for the concluding show of a series, tour, or run, especially in theater, concerts, and similar staged events.
The final performance of the tour was held in Osaka.
Tickets for the last performance sold out quickly.
千秋楽 specifically refers to the final day of a sumo tournament or a theatrical run, while 最終公演 is a more general term for any final performance.
初日 means 'opening day' or 'first performance', the opposite of 最終公演.
Compound of 最終 (final, last) and 公演 (public performance).