There's something for everyone - fancy dress, mascot races, entertainment, and of course some cricket!
Derbyshire Falcons, Essex Eagles, Notts Outlaws and Worcestershire Rapids will be aiming to lift the T20 Blast trophy at Edgbaston on Saturday.
But how much do you know about previous Finals Days? Try our quiz...
How much do you know about T20 Finals Day?
Edgbaston hosts T20 Blast Finals Day on Saturday - how much do you remember about the finales of the past 16 years?