Entertainment Tweet by @SheffCityHall Published Dec. 1 2020 07:50 PM ICYMI @Collabro Greatest Hits Tour will open here @SheffCityHall on Saturday 9 October 2021 - 🎫 are on sale NOW 👉https://t.co/6y35QMNNLu, — Sheffield City Hall (@SheffCityHall) December 01, 2020 19:50