Heritage Open Day: The Concert Hall, opened by Cadbury in 1927, is a unique space. Step inside to learn about its history and listen to some live music and performances on the stage. The Cadbury Concert Hall was officially opened on March 19th 1927. It formed part of the new Dining Room Block at Bournville which opened in 1926. The Concert Hall could seat 1,050 people when it first opened. The stage can accommodate a choir of 200 people and there was originally an orchestra pit in front of the stage and a large concert organ on the left hand wall when looking from the back of the room.