final performance; closing day; last show
Used for the final day or performance of a theatrical run, concert series, or similar entertainment event.
Today is the final performance of this stage play.
Tickets for the closing day sold out immediately.
final day of a sumo tournament
Specifically refers to the last day of a sumo tournament (basho).
The championship was decided on the final day of the tournament.
The play will reach its closing performance next week.
He capped off the tournament's final day with a championship win.