Chateau de Cande is currently advertising an exhibition of 'the marriage of the century', that of Edward, Prince of Wales to the American divorcee Wallis Simpson on June 3rd 1937. Not sure how it differs from the usual excellent display but if you haven't been it is well worth a visit.
From Chateau Cande's website:
"Back on the marriage of the century: the Candé estate proposes you to relive this incredible marriage called “marriage of the century”.
Until June 04th, come to discover this famous marriage as you have never seen it ! New scenography of the castle and other surprises wait for you!"