The phrase "big finale" means the exciting ending or conclusion of something, often featuring a grand or impressive event or performance. Full definition
Fernie Alpine Resort's big finale event of the 2017 - 2018 season. (tourismfernie.com)
«The retro gaming community has grown by leaps and bounds over the past few years, and the Retro World Series wants to give this community the ability to enjoy retro games throughout the year with a great, big finale at the end.» (tecmobowl.org)
People won't expect a big finale if you choose your timing wisely. (businessinsider.com)