Normandy Heritage Weekend
It's a fantastic opportunity for you to enjoy the history and heritage Normandy has to offer. What's more, many of the events are free or offer reduced tariffs. The events are varied as there's so much going on. Castles, abbeys, churches, manor houses, chapels and other historic buildings will open their doors to the public. The Cotentin tourist train will be running and you can view manuscripts from Mont-Saint-Michel at the Scriptorial in Avranches.
Last year I visited both the castle and abbey at Saint-Sauveur-le-Vicomte as well as Hambye abbey and the chateau at Gratot. You can read about these sites here. You'll also be able to visit them as part of the Normandy Heritage Weekend. The full programme of events is here.
With so much going on it's going to be a busy weekend! However, it's very well organised and a gives you the opportunity to visit for free.