ROCK IN THE SEINE 2023 See you on August 25, 26 and 27, 2023 at the Domaine National de St-Cloud for the Rock en Seine Festival 2023! Born in 2003, Rock en Seine has become one of France's top mega-festivals. Held just outside of Paris at the incredibly scenic Domaine National de Saint-Cloud (an 1100 acre historical park), this festival showcases the best of international and regional rock on five unique stages. More Info below.