In Seine-et-Mronne? Wait, the department is Seine-et-Marne. Correct.
In Seine-et-Marne, the Château de Brie-Comte-Robert will host the 2026 Fête de la Musique, set against a medieval backdrop full of character. An evening of outdoor concerts, as attendees rediscover a historic site in the heart of town on Saturday, June 21, 2026.