Related Clues:

• Series ender
• Climax
• Last part
• Last number
• Farewell performance
• 'Grand' thing
• Concluding part
• Epilogue or coda, e.g.
• Capper
• Last act
• See 109 Down
• Final performance
• Concluding appearance
• Epilogue or coda
• The launch of fifty fireworks in the span of a minute, say