curtain speech

noun Theater.
  1. the final speech of an act, scene, or play.
  2. a brief speech by an actor, producer, author, or the like, immediately following a performance, usually delivered in front of the closed curtains on the stage.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for curtain speech

curtain speech

noun
  1. a talk given in front of the curtain after a stage performance, often by the author or an actor
  2. the final speech of an act or a play
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012