It received its world premiere under its original title The Band at the Manchester Opera House, in September 2017, before embarking on a UK and Ireland tour and opened at the Theatre Royal Haymarket at London's West End in December 2018.
In August 2022 it was announced that a special adaptation of Greatest Days would be performed exclusively onboard new P&O Cruises Ship Arvia.
On Thursday the 8th of June 2023, Greatest Days premiered on Arvia’s sister ship Iona.
In September 2022, it was announced that the musical would tour the UK and Ireland in 2023, renamed as Greatest Days.
2017–19 2019 2023–24 2023 A film adaptation titled Greatest Days featuring Jayde Adams, Aisling Bea, Alice Lowe and Amaka Okafor was written by Firth and directed by Coky Giedroyc with choreography by Drew McOnie.