grand finale

Etymology
From plus.

Noun

 * 1)  The concluding event or development in a process, performance, or other series of events, made with a special flourish and often in a remarkable or spectacular manner.
 * 2) * 1810,, Letter to the printer of the first edition of Lady of the Lake (from 1883 edition, edited by William J. Rolfe, Canto 6, line 605n):
 * I send the grand finale, and so exit the Lady of the Lake from the head she has tormented for six months.