Fest-Noz is a festive gathering based on the collective practice of traditional Breton dances, accompanied by singing or instrumental music. The strong Breton cultural movement has preserved this expression of a living and constantly renewed practice of inherited dance repertoires with several hundred variations, and thousands of tunes. About a thousand Fest-Noz take place every year with participants varying from a hundred to several thousand people, thousands of musicians and singers and tens of thousands of regular dancers. Beyond the practice of the dance, the Fest-Noz is characterized by an intense camaraderie among the singers, musicians and dancers, significant social and intergenerational diversity, and openness to others.