Why Brittany?   Well, I was told that there was generally a Fest Noz going on in one village or another on almost any summer weekend. The difficulty was in finding it (not standard tourist info) and of course finding lodging, since small towns often don't have any for foreigners (I lucked out with the village convent and some wonderfully welcoming sisters).   
The Auvergne (Occitan country) was a much harder nut to crack . . .