|Picture taken from University of Cambridge advertising|
I apologise for promoting an event a little distance away from south-west Bedforshire, but Cambridge is only an hour away (or less) by car and, as this event is scheduled during half-term, a visit is a realistic proposition.
Cambridge is obviously famed for its university, but also contains some fascinating and well-stocked museums. This is an annual event where many of the museums open to the public in the late afternoon and early evening, and a lot of the exhibitions are designed to be experienced under torchlight. It is also suitable for just about all ages so it's a great night out for the kids. Further details are available here.