Attention culture lovers and bargain hunters: here’s an opportunity you won’t want to miss! Each year, on the third weekend of September, the Heritage Days land across Europe. This flagship event on the cultural calendar invites us to explore our heritage through a wide range of tours and brand-new activities.
For the occasion, museums, monuments, castles, and churches are taking part, unveiling their secrets. Venues that are usually off-limits to the public, including ministries, major institutions, and even embassies, are also joining the event and opening their doors to visitors, exceptionally.
Across the four corners of the Île-de-France, the heritage takes center stage during this exceptional weekend on September 19 and 20, 2026. This is a chance to explore the original programs, often free and designed for all audiences. Whether you’re with family, friends, a partner, or flying solo, there’s something for everyone. And why not take the opportunity to hunt for regional treasures, specifically in the Seine-et-Marne?
The department of 77 boasts a rich heritage that remains too little known! A case in point is the town of Lagny-sur-Marne, a charming hillside settlement perched beside the river. Against this bucolic backdrop, Lagny-sur-Marne reveals a fine medieval heritage to discover during the Heritage Days!
14 General de Gaulle Boulevard
Opening of "Floraison" by René Barba
The inauguration of the sculpture "Floraison" by artist René Barba as part of the Urban Art Trail.
Participation requirements: Free | No booking required
Schedule: Saturday, September 19, 2026 — 11:00–11:30
Our Lady of the Ardents Abbey
Candlelit Concert
Within the Notre Dame des Ardents church, join us for a candlelit concert:
1st act Safar trio: bass clarinet, Indian tablas and oud, featuring Daniel Jover, Franck Robquin and Mo Selouane
2nd act Beethoven's Pastoral Symphony, performed by the Union Musicale Symphony Orchestra
As part of European Heritage Days and the Fondation du Patrimoine's fundraising drive to restore the church.
Conditions of participation: Free | No reservation required
Schedule: Saturday, September 19, 2026 — 8:30 PM to 10:30 PM
A tour of the organ at Notre-Dame-des-Ardents Church
The Musique et Orgue association in Lagny-sur-Marne will offer guided tours of the organ at Notre-Dame-des-Ardents Church.
Participation requirements: Free | No reservation needed
Timings : Sunday, September 20, 2026 — 3:00 PM to 3:30 PM, 4:00 PM to 4:30 PM, 5:00 PM to 5:30 PM
Organ recital at Notre-Dame-des-Ardents Church
Join us for an organ recital at Notre-Dame-des-Ardents Church, presented by the Musique et Orgue association of Lagny-sur-Marne.
Participation terms: Free | No reservation required
Schedule: Sunday, September 20, 2026 — 6:00 PM to 6:30 PM
Lagny United Protestant Church
Visit to Lagny Temple, a remarkable heritage site
Come and discover the history of Lagny's Temple, along with the arrival of Protestant missionaries by barge on the Marne.
Participation requirements: Free | No reservation required
Hours: Saturday, September 19, 2026 — 11:00 to 18:00 | Sunday, September 20, 2026 — 09:30 to 15:00
Charles Vanel Space
René Barba's Exhibition
“In an imagined world where humans and nature are one, my sculptures become hybrid beings.” René Barba
Participation requirements: Free | No reservation required
Hours: Saturday, 19 September 2026, 10:00–12:00, 14:00–17:00 | Sunday, 20 September 2026, 10:00–12:00, 14:00–17:00
Coal Miners
When two miners are trapped underground after a methane blast. In 1965, in Avion, after the Courrières and Hersin disasters, a gas explosion hits the Liévin mines, shaft No. 7; it will claim 21 lives. But in the official record, what isn’t told is that a miner of Algerian origin named Ahmed and a worker of Polish origin named Stéphane found themselves more than 300 metres deep in a pocket of air.
That, at least, is the angle we want to tell.
You’ll be swept up by a powerful story that unfolds six feet underground, in an utterly unforgettable setting.
Participation conditions: Free | Booking required - https://esp-charlesvanel.notre-billetterie.com/formulaire?dial=Sommaire, 01 64 12 47 50, billetterie-vanel@lagny-sur-marne.fr
Schedule: Sunday, September 20, 2026 — 5:00 PM to 6:30 PM
City Hall
Murder Party, Sherlock Holmes and the Phantom of the Opera
Following a string of unexplained incidents, Christine Danné, a rising star of the Opera de Parys troupe, enlists the help of her old friend, Dr. Watson, to probe the mysteries. Sherlock Holmes then secretly goes undercover, posing as Shirley Cole, Christine’s understudy, unable to resist shadowing the good doctor. Two hours before showtime, the stage manager Mike Charpentier is found dead, with a fresh message from the Phantom at his side. Holmes reveals his identity and his initial conclusion: the Phantom will strike again at one of them before the curtain rises.
Participation rules: Limited to 60 places – ages 6 and up – Reservations required | Free — call 01 64 12 47 50, inscription-culture@lagny-sur-marne.fr
Schedule : Saturday, September 19, 2026 — 2:30 PM–4:00 PM, 5:00 PM–6:30 PM
Willow House
Laying of a commemorative plaque in honor of Léon Hatot
Installation of a commemorative plaque for Léon Hattot (1883-1953), a visionary watchmaker-jeweler and painter who lived in Lagny-sur-Marne
By the Patrimoine et mémoire vivante du Pays de Lagny association
Conditions of participation : Free | No reservation required
Horaires : Saturday, September 19, 2026 - 2:00 PM ⤏ 2:30 PM
Gérard Billy Intercommunal Media Library
Photo exhibition
This photography exhibition showcases vintage wall advertisements that are fading away—those that line the roadsides and the walls of our villages. The images on display trace the history of advertising, those old painted signs that disappear over time due to weathering but also as society evolves and its consumer habits change.
To immerse visitors in an era that has all but vanished, the photographs are accompanied by jingles and audio commercials played throughout the exhibition.
By Jean-Paul Morel and Michel Campos, photographers
Participation requirements: Free admission during the library’s opening hours — No reservation required
Hours: Friday, September 18, 2026 - 10:00 ⤏ 18:00 | Saturday, September 19, 2026 - 10:00 ⤏ 18:00
Exhibition "Heritage at Risk"
In the face of mounting environmental, social, and geopolitical challenges, our cultural heritage is at risk. In the media library’s reserve, certain archival treasures show the wear of time: engravings of vanished monuments, damaged or torn bindings, patched up restorations… This exhibition brings these fragile documents into the foreground and invites readers to learn about the measures being taken to safeguard and preserve them.
Exhibition organized by the librarians responsible for the heritage collection
Participation conditions: Free entry during the library's opening hours - Free | No reservation required
Hours: Friday, September 18, 2026 — 10:00 AM to 6:00 PM | Saturday, September 19, 2026 — 10:00 AM to 6:00 PM
Restoration of Old Books
Do you know the BnF’s Technical Centre? Based in Bussy-Saint-Georges, it houses restoration workshops whose mission includes consolidating, maintaining, or restoring the BnF’s book and graphic-document collections (Tolbiac site collections, the Richelieu Library, the Arsenal Library, and the Bibliothèque‑musée de l’Opéra Garnier). On the occasion of European Heritage Days, master book restorers travel to the media library for a demonstration of bookbinding and stitching. Amateurs or the merely curious, don’t miss the chance to see these professionals of old books at work.
By the BnF Technical Centre
Participation conditions: Free entry, subject to availability and your chosen duration — Free | No reservation
Schedule: Friday, September 18, 2026 – 2:00 PM to 5:00 PM
Fountain Square
Artists' Promenade
An open-air art walk featuring about thirty artists.
Participation requirements: Free | No reservation required
Schedule: Saturday 19 September 2026 — 10:00–19:00 | Sunday 20 September 2026 — 10:00–18:00
Jazz concert by the Pièce Montée group
The Pièce Montée group will perform a jazz concert.
Participation terms: Free | No reservation required
Schedule: Sunday, September 20, 2026 — 11:00–12:00
Gourdine Quay
Jazz Concert
A jazz concert is on the program: Quinte & Sens invites Ella Rabeson.
Participation conditions: Free | No reservation required
Schedule: Sunday, September 20, 2026 — 4:00–5:00 PM
Foucher de Careil Square
Live painting performance by Star97
Star97 has been a muralist and painter for over 15 years. Using spray cans, he crafts murals that aim to reveal the strength of faces and places, rendered in an engaged and contemporary style.
Come witness the making of a painting and take home a piece of it with you.
Participation requirements: Free | No reservation required
Hours: Sunday, September 20, 2026 — 10:00 AM to 6:00 PM
Dates and Opening Time
From September 19, 2026 to September 20, 2026
Location
Lagny-sur-Marne
77400 Lagny-sur-Marne
77400 Lagny sur Marne
Route planner
Official website
www.lagny-sur-marne.fr
