What to do for Music Day in Montreuil? This outer suburb of Paris, located to the east of the city in the Seine-Saint-Denis department, unveils its impressive program for Saturday, June 20 and Sunday, June 21, 2026. Free concerts by Franglish, Keziah Kones and 2L, plus a fireworks display... Discover the concerts and musical happenings on offer as part of the city’s festival and the urban cultures festival, which again this year coincides with Music Day.