Complexity

13/04/2026

🌑 We are excited to announce that the wild “astro-deathmetal” outfit ‘Cryptic Shift’, who released their space trash milestone ‘Over space & Supertime’ recently, join the bill for Complexity Fest ‘26.

Unfortunately Hollow Jan isn’t able to perform this year due to a misfortunate booking inconvenience. We might see them back in ‘27 and wish them the best. See you all at our fest hopefully and more new names soon!

03/03/2026

☀️With the first names for Complexity Fest 2026, we’re pulling out all the stops: from the physical precision of snare-drum soloist .kiyasu in an alternative space within the building, to the rhythmic whirlwind of Venezuela’s , locking prog and post-hardcore tightly together.
Italy’s .music brings over twenty-five years of underground experience and returns with new material that sharpens their heavy, uncompromising sound even further. celebrates ten years of Complexity with the next phase of their rave-meets-black-metal universe, armed with new work and an audiovisual approach that takes full control of the room.
And then there’s performing in the Netherlands for the first time: Korean screamo built on long tension arcs, raw outbursts, and a cult status that stretches far beyond their borders. Five acts, five distinct worlds, one festival bringing it all together.

More to be announced!

🎫 Get your early bird tickets until Monday match 6th before 12:00

Beleef Complexity Fest 2026 op 15 aug in Patronaat Haarlem: het festival voor avontuurlijke, grensverleggende heavy muziek met internationale acts en innovatieve sounds.

12/01/2026

The new poster for toe’s Loneliness Will Shine 25th Anniversary Tour is out now. The ‘Complexity Presents’ show in Patronaat is already sold out, but more shows and Complexity Fest 2026 are on the horizon. Stay tuned!

17/09/2025

We are very much looking forward to see, hear, witness showcasing their immersive eclectic sound pallet in which we hopefully get a glimpse of the new album that is released on the 3rd of October. Even better is welcoming back .stepmother after their hypnotic show on the mainstage at Complexity Fest 2024. Don't miss out on this one we'd say you!

28/08/2025

We’d like to thank all you beautiful people from the bottom of our hearts for an incredible day at Patronaat last Saturday at Patronaat and last Friday at Slachthuis! The positivity and energy were massive, from backstage all the way to the front.

We definitely felt a shared passion for music in the broadest sense. It’s always exciting for us not knowing exactly what to expect - and yes, we do like to take some risks - but we look back (and forward) with a great sense of satisfaction, together with you.

Here’s a bunch of stills to spark some short-term nostalgia… or maybe a little FOMO.

Thanks to in-house photographers & . All photos will be uploaded to our page soon!

28/08/2025

Photo’s by Rodhnny Acosta - . More to be uploaded soon!

28/08/2025

Photo’s by Sabine de Graaf - . More to be uploaded soon!

23/08/2025

🐎 Today is the day! The one and only is showing off our merch, which is available in stage 3. Limited availability, so don’t sleep on it.

See you at 14:30!

20/08/2025

⏰ It’s here, the final timetable! Surprises may still pop up, so keep your eyes peeled. Only 3 sleeps until Complexity Fest 2025. See you there!

18/08/2025

🍻 After ECHT!’s set, the night isn’t over just yet. From 23:00 onwards, we invite you to head over to the Anti-Bar, just across the street from Patronaat. It’s the perfect spot to grab a drink, catch up with friends old and new, and talk through your favorite festival moments.

📍Zijlstraat 21, Haarlem

16/08/2025

🥘 At Complexity Fest you won’t go hungry. Two amazing caterers will keep you fueled: ABSEA Foodtruck brings fresh, colorful streetfood with a comfort twist, while Eef & Lien serve up vibrant, plant-based dishes full of flavor. All options are vegetarian or vegan!