Celtic communities from Ireland, Scotland, Wales, Cornwall, Isle of Man and Galicia in northwest Spain congregate with Bretons at the Festival Interceltique over 10 days in early August.
Morgat's place d'Ys area hosts this world music fest for three days in early August.
A celebration of traditional Celtic music, costumes and culture takes place over six days in late July. Other events take place around town during this time as well.
No fewer than 100,000 visitors join Dinannais townsfolk dressed in medieval garb for the two-day Fête des Remparts, held in late July every even-numbered year.
Plan to be in Brest on a Thursday night during summer, when Les Jeudis du Port fills the port with live rock, reggae and world music, as well as street performances and children's events.
Brest’s electronic music fest in early July.
In early December, Rennes hosts one of France's biggest indie music festivals at venues all across the city.
Head to the Jardin de l'Évêché on Thursday evenings from mid-June to mid-September to take in traditional Breton music and dance.
Traditional Breton dancing and music take place in Rennes' beautiful Parc du Thabor on Wednesdays during June and July.
Rennes' old town comes alive during this music and theatre festival in the first week of July. They are also partnered with Dimanche à Rennes, which offers a year-round program on Sundays.