Heritage Open Day: Tom Thumb Theatre is one of the smallest and most enchanting theatres in the world. Heritage Open Days provides a unique opportunity to see behind the scenes and enjoy tea, coffee and cake. The theatre is holding Open Days on 11th, 12th, 13th, 17th, 18th 19th and 20th September, from 12.00 noon on each day. The theatre will be open to explore, including backstage.