The exciting "Living Advent Calendar" is back this Christmas. Every evening at 18.15PM there is a different, short, live performance, lasting a minimum of 15 minutes, often longer, at a different "pop-up" venue each night around Windsor and Eton. Sometimes some nibbles/drinks are provided.
To keep an element of surprise, the nature of each event is not published, but the venues are published in advance. So you can just turn up on the evening and see what is on!
Here is the schedule, showing the locations of each event:-