In.out.sider festival

Name: In.out.sider festival
Address: Rue Adolphe Lavallée 39, Brussels, 1080, BE
Telephone: +33778216724

Page d'Accueil
België
Brussels
In.out.sider festival

Alternative music festival in Brussels with a diverse lineup celebrating raw artistic creativity.

16/09/2026

IN.OUT.SIDER is back from October 8th to 10th, and we’re looking for a team of volunteers to help make the festival happen!

We’re looking for people to help with entrances, artist care, backstage catering, and general support during the evenings of October 9th and 10th at LaVallée.

Interested in joining a great team and being part of an event like no other?
Drop us a DM or email us at [email protected]

Kisses 💜
In.out.sider team

14/09/2026

ONE MONTH until IN.OUT.SIDER takes over.

Thursday 08/10 at Cinéma Aventure,
Friday 09/10 and Saturday 10/10 at LaVallée.

A festival for music, beautiful chaos, unexpected encounters
and people who’d rather not know what’s coming next.

🎟️ €8 /€10 /€15 - link in bio

08.10 - Rester Vivant by Romain Multier and Colin Péguillan
Screening at Cinéma Aventure + discussion about mental health on screen

ON STAGE at LaVallée :

Friday 09.10 : Bernardino Femminielli, Badaboum, Marion Laser x Lazlo Parks x Caillou, Ultimate Thunder, Wodiwo, Les Ami.e.s de La Nature, DJ Babou Alice x Mikamayonnaise

Saturday 10.10 : Psychotic Monks x Futur Composé, Oonagh Haines, Xaxalxe, Splitter Splatter, Third Wave, Sainte Lucie, Mü, LaCloture

Exhibition by Ateliers Indigo + Scenography by Magali Cadelli, Ardian Ramadanovic, Solène Caldéron (Centre Sésame)

COME AND JOIN THE PARTY!

Poster by Jonathan Marinier & Sylvie Astié, based on a work by Thomas Dayes from Créahmbxl.

11/09/2026

Probably the most iconic post-punk band to emerge from France, The Psychotic Monks made their mark on the alternative scene with the release of their album Silence Slowly and Madly Shines in 2017. That was almost ten years ago. Since then, the band has matured, refined its sound and cemented its place as a key figure in a dark, raw and visceral strain of rock.

Taking a creative break and looking for new sources of inspiration, The Psychotic Monks created an exclusive set for the Futur Composé Festival and Rock en Seine 2025. This unique project is now hitting the road. The band is collaborating with five musicians from three institutions supporting people with autism spectrum disorder : Étienne from ESAT Turbulences on keyboards; Markus from Perce-Neige Alternote on drums; Enkhjin and Jean from Perce-Neige Alternance Bourg-la-Reine, respectively on the yatga and vocals; and finally Thierry Dupont from the band Ron Pon.

With their experimental and instinctive approach to music, these musicians resonate naturally with the band’s universe, where chaos and improvisation always find their balance.

Live on Saturday 10.10 at
Tickets from 10€, link in bio
–
Festival In.out.sider
Brussels | 08.10–10.10

10/09/2026

CHANGE OF PLANS 🌪️

In.out.sider Festival is not always a stable creature. Things change, things break, things appear out of nowhere. You know, festival stuff.
Keeping it short, here are a few little changes to the line-up:

Due to personal reasons, Foudre Rockeur unfortunately has to cancel their show.
Oonagh Haines, who was supposed to play on Friday, will now be joining us on Saturday instead.

Taking her place on Friday: none other than the legendary 𝐁𝐄𝐑𝐍𝐀𝐑𝐃𝐈𝐍𝐎 𝐅𝐄𝐌𝐌𝐈𝐍𝐈𝐄𝐋𝐋𝐈 !

Bernardino Femminielli is a multidisciplinary artist whose practice brings together music, video, performance, poetry and cinema under the guise of a nostalgic provocateur. Moving fluidly from French chanson to brutal Italo-disco, from mutant industrial soundscapes to dense cosmic drones, his sonic explorations reflect his ever-shifting alter egos. His work and persona form a synthesis of mysticism, transgression and pleasure - a living character he embodies on the road.

Live on Friday 09.10 at
Tickets from 10€, link in bio
–
Festival In.out.sider
Brussels | 08.10–10.10

06/09/2026

Chadou, Lou K, François Geslin and Oskar Cappon bring their musical worlds together in a creation born from a unique adventure: three days spent in residence aboard the Urban Boat, travelling along the water and immersed in nature. A collective experience of musical observation and aquatic transmission, where different worlds intersect, nature becomes musical material, and every sound tells a little piece of this timeless escape.

Their compositions are joined by field recordings and texts by Frédéric Deschamps, who captures, in his own way, the impressions, encounters and moments of the journey. Between music, voices, live-recorded sounds and fragments of storytelling, Les ami.e.s de la nature create a free and sensitive sonic travel diary, where every sound becomes part of the journey.

Live on Friday 09.10 at
Tickets from 10€, link in bio
–
Festival In.out.sider
Brussels | 08.10–10.10

01/09/2026

BADABOUM is an all-star female trio affiliated with the infamous underworld of La Grande Triple Alliance Internationale de l’Est, featuring Armelle (The Dreams, Heimat, Le Renard), Carine (Krinator, Headwar, Les morts vont bien) and Solène (Dudu Geva, Avenir, etc). Together, they play post-punk reminiscent of KLEENEX / LILIPUT or MALARIA!, with generous doses of reverb, electronic organ and good vibes.

On stage, they take turns screaming, stomping and singing in an indecipherable Italian, a fake German and acceptable French. BADABOUM will bring you as much joy as chaos and terror.

Live on Friday 09.10 at
Tickets from 10€, link in bio
–
Festival In.out.sider
Brussels | 08.10–10.10

28/08/2026

From the twisted genius behind Infecticide comes DJ GLUTRON - a DJ set from another dimension.

« Humans of planet Earth.

If this message has reached you, it is already too late.
Your ears have been selected.
You must now take part in a vibrational recalibration session.

The entity known as DJ GLUTRON will broadcast a succession of unauthorized musical objects. Some will cause involuntary movements. Others will temporarily alter your perception of time, rhythm, or gravity.

Any resemblance to a party is purely accidental.

For your safety, do not miss DJ GLUTRON. »

👽

DJ set on Saturday 10.10 at
Tickets from 10€, link in bio
–
Festival In.out.sider
Brussels | 08.10–10.10

25/08/2026

Wodiwo’s music fuses raw energy with fragile melancholy, creating a sound that feels both intimate and collective. Using a loop station, they build songs layer by layer: Odile’s grounding basslines and emotive voice form the core, while Oskar’s dynamic percussion and atypical vocalisation bring pulse and contrast. The result is an unpolished yet powerful collage, minimalist in form, but rich in texture and deeply expressive.

Live on Friday 09.10 at
Tickets from 10€, link in bio
–
Festival In.out.sider
Brussels | 08.10–10.10

18/08/2026

As a wise man once told them: DJs are like cooks. No matter how talented a cook is, if they only have sh*tty ingredients, the dish will be terrible. On the other hand, even a mediocre cook can make a good dish if the ingredients are high-quality. LaCloture belongs to the latter category.

They don’t really know where they’re going, but they’ll happily take you there, ending the festival in a glorious chaos.

Live on Saturday 10.10 at
Tickets from 10€, link in bio
–
Festival In.out.sider
Brussels | 08.10–10.10

06/08/2026

Third Wave is a slightly mad electro duo blending synthesizers, analog machines, and drum machines like no one else.

On one side is Edgard Nerise, a multi-talented pianist (also a member of Mono Siren), who turns every key into a sonic explosion. On the other is Singularity A.I., aka DJ Lovepills, king of Brussels nightlife, commanding an arsenal of drum machines, pedals, and electronic gear. Together, they create a world where melody meets beats -sometimes serious, often a bit crazy, but always surprising.

Get ready to dance, smile, and maybe even lose track of time…

Live on Saturday 10.10 at
Tickets from 10€, link in bio
–
Festival In.out.sider
Brussels | 08.10–10.10

Adresse

Rue Adolphe Lavallée 39
Brussels
1080

Téléphone

+33778216724

Site Web

https://www.instagram.com/in.out.sider_festival/

Notifications

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