Chapiteau Sonore: An open-air music festival in the Yvelines

The festive rendezvous of Château Éphémère is back for a fifth edition in Carrières-sous-Poissy, in the Yvelines. On Saturday, September 26, 2026, enjoy a music festival set in a verdant outdoor space, featuring concerts, family-friendly entertainment, a pyrotechnic show, DJ sets, workshops & activities, for both adults and children, making it accessible to families.

For the past 10 years, Château Ephémère, a space dedicated to digital, sound and musical creation, has been based in the converted 1907 heritage site of Château Vanderbilt, and organizes its own festival to bring together artists and their audiences.

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From 12:30 p.m. to 1 a.m., the party heats up with an outdoor dancefloor, live shows, and DJ sets featuring ATOEM, TOUT LE MONDE S’APPELLE CLARA, CAOS.808, LE KAIJU, NO SEX LAST NIGHT, the CIE LA BRÜME with a pyrotechnic performance, and BOUM SHAKALAKA, a hip-hop block party for kids!

This year, an Agora opens to spotlight the talents of local artists, associations, and initiatives: an introductory DJ session by Ecstatic Playground, holistic healing with Ysabelle (massages), a virtual reality escape game with Kevin Ardito, the Telling the Flowers exhibition by Mathias Pasquet, gardening and cooking workshops with the La Sève association, and a tour of the Fablab with Alexandra.

A shuttle service is available for 2 euros between the Château and Poissy train station between 10.30pm and midnight, so you can leave in complete peace and quiet.