Of course France is a secular republic. You know! Secular in the way that all the shops close on religious holidays along with all the factories and offices and airports and petrol stations.
The only thing we could do was to limp in to Caen, put up in the Ibis and wait for the morning. Unexpected pleasures though are often the best. This is a nice little town which we wouldn't even have driven through. As it was we had a nice walk around the medieval castle followed by a lovely meal outside in the medieval square in the shadow of the castle.