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EO2S 2026: Open Source E-commerce Summit

Reading time: 12 min Last updated: March 21, 2026

EO2S 2026: An Open Source E-commerce Summit Redefining the Game

EO2S 2026 — Ecommerce Open Source Summit — is Europe’s first open source e-commerce summit. It takes place on March 26, 2026 at Le Nida, Issy-les-Moulineaux (Paris), organized by Friends of Presta (non-profit association, 1,000+ Slack members).

This is the first joint appearance of PrestaShop and Sylius since their merger at the end of 2025, following PrestaShop’s acquisition by cyber_Pixel. Mikołaj Król, CEO of both projects, will deliver the closing keynote. 17+ sessions cover AI, cybersecurity, e-invoicing, and digital sovereignty.

Ticket at €30 — shop.friendsofpresta.org.

TL;DR — If you only have 30 seconds: PrestaShop + Sylius on stage together for the first time, unveiling of the first-ever French CMS E-commerce Barometer, 17+ sessions, 150+ professionals. March 26, Paris. €30.

EO2S 2026 Program: 5 Key Moments

1. CMS E-commerce Barometer in France (Opening Keynote — 9:15 AM)

The morning opens with what could be the most significant announcement of the day: the unveiling of the first-ever French CMS E-commerce Barometer.

Why does it matter? Because the French open source e-commerce market has never been mapped independently and with hard data. Between Shopify’s figures, WooCommerce estimates, and assumptions about PrestaShop, there was no clear, factual vision.

Olivier Binet (Managing Director, PrestaShop), Christophe Vidal (President, Friends of Presta), and Thomas Rayrat (Vice President, Friends of Presta) co-sign this opening keynote. If you’re an e-commerce professional, this data directly concerns you — whether you’re a developer, integrator, merchant, or software vendor.

I’ve had the opportunity to speak with several ecosystem players over the past few months. This barometer, if it delivers on what we’re being promised, could well become the reference for all consulting firms, media outlets, and decision-makers who talk about e-commerce without ever having reliable figures on the open source segment.

2. PrestaShop and Sylius: First Joint Appearance on Stage

One year after the launch of PrestaShop’s Call for Contribution, Paule Morizot (Head of Product, PrestaShop) returns with contributors to take stock. What worked? How has community governance evolved? What are the current priorities?

It’s also an opportunity to understand how Sylius fits into this dynamic — and most importantly, how the two projects plan to work together on a shared Symfony foundation.

3. E-Invoicing with PrestaShop: 2026 Obligations

Mandatory e-invoicing in France (and across Europe with EU Directive 2014/55/EU) remains a topic where many merchants are sailing blind. The roundtable moderated by Marie-Sophie Cuinet (VP Category Management, PrestaShop) brings together Atoo Next and OpenSI for a concrete discussion:

  • Where does the obligation stand? Timeline, penalties, exemptions
  • What open source solutions are available today?
  • How to migrate without breaking things?

If your store isn’t yet e-invoicing compliant, this session should be your top priority.

4. Sessions: AI E-commerce, SEO, Cybersecurity, Digital Sovereignty

The program covers a broad spectrum of topics:

  • Agentic commerce — when AI makes autonomous purchasing decisions
  • AI in e-commerce — concrete use cases beyond the chatbot
  • SEO in the AI era — how AI language models read your product listings
  • E-commerce cybersecurity — 2026 threats, defenses, best practices
  • Digital sovereignty — the open source argument against US SaaS solutions
  • Sylius migration — real-world experiences and best practices
  • PrestaShop internationalization — go global without losing your mind

If AI is a topic that interests you — and it should — I refer you to my article on AI governance in PrestaShop which lays out what you need to master before deploying artificial intelligence in a store.

5. Mikołaj Król — Closing Keynote, PrestaShop & Sylius

The closing is signed by Mikołaj Król, CEO of PrestaShop and Sylius since the end-2025 merger. This is the first time he speaks publicly before both communities gathered together.

Beyond the visionary talk, we can expect concrete announcements on:

  • The technical roadmap for PrestaShop + Sylius convergence
  • The expected synergies between the two platforms
  • The European open source strategy against market concentration

Who Is Mikołaj Król, CEO of PrestaShop & Sylius?

Behind this closing keynote stands a man: Mikołaj Król. Before leading PrestaShop and Sylius, he drove Sylius’s growth to make it one of Europe’s most advanced Symfony e-commerce frameworks. His profile is technical, not marketing — which sets him apart from the usual ecosystem keynotes.

When cyber_Pixel acquired PrestaShop at the end of 2025, he was appointed to lead both projects. His arrival wasn’t an accident: it was the choice of someone who knows the field, knows the tech, and wants to build rather than manage.

His closing keynote at EO2S 2026 will likely be the most important of his young joint tenure at the helm of both platforms.

EO2S vs FOP Days: What Really Changes

The name change isn’t cosmetic. Here’s what the EO2S rebrand concretely means:

Former format (FOP Days) New format (EO2S)
Focused on the PrestaShop community Open to the entire European open source ecosystem
Technical day format Conference + roundtables + workshops + networking format
Dev/technical audience Mixed audience: devs, merchants, decision-makers, agencies
Community sessions Structured program with keynotes, roundtables, workshops
France Stated European ambition

The leap in maturity is noticeable. Friends of Presta is moving from a community meetup to a structured professional event.

Partners on Site: The Full Ecosystem

EO2S 2026 brings together a panel of partners representative of the open source e-commerce ecosystem:

Partner Positioning Site
PrestaShop Open source e-commerce CMS friendsofpresta.org
Sylius Symfony e-commerce framework friendsofpresta.org
OpenSi Open source ERP/PIM for commerce friendsofpresta.org
Atoo Next E-invoicing solutions friendsofpresta.org
Lyra Online payments friendsofpresta.org
Mollie Payment platform friendsofpresta.org
Crisp Chat and customer support friendsofpresta.org
Doofinder E-commerce search / SEO friendsofpresta.org
Store Commander PrestaShop administration tools friendsofpresta.org
KerAwen Open source POS software friendsofpresta.org
Motive E-commerce logistics friendsofpresta.org
Gladhost Hosting friendsofpresta.org
Versus Venture Holding PrestaModule & BusinessTech friendsofpresta.org

Covering the entire value chain of an online store.

What This Event Says About the Health of Open Source E-commerce

Beyond the program, EO2S 2026 sends a clear signal: European open source e-commerce isn’t retreating — it’s restructuring.

A few facts:

  • PrestaShop powers 200,000+ active stores across 80+ countries, holding the #1 position in France, Poland, and Spain (source: PrestaShop)
  • The PrestaShop + Sylius merger creates a coherent technical player (shared Symfony foundation, convergent roadmap)
  • The Friends of Presta community (non-profit association, 1,000+ members) brings stable, independent governance
  • Demand for sovereignty-aware solutions (European hosting, data in Europe, no dependency on a US hyperscaler) creates an opportunity window

EO2S 2026 is the first public rendezvous of this new era. The French CMS E-commerce Barometer, if it holds up, could become a reference for sector professionals.

Who Should Really Go (And Who Can Skip It)

Let me be direct. Not every event is for everyone. Here’s my honest analysis:

You should go if you’re…

1. PrestaShop / Sylius developer The technical sessions on Sylius migration and future architecture will give you a concrete view of where the platform is headed. It’s also a chance to network with core contributors — which is always valuable.

2. E-commerce merchant with significant volume The e-invoicing roundtable alone justifies the trip. And the barometer will give you data-backed arguments for your strategic discussions.

3. Agency or module vendor You’re in the right place to understand market direction and meet future partners or clients. In-person networking is still irreplaceable.

4. IT decision-maker with sovereignty concerns The open source vs. US SaaS argument takes on new dimensions with the PrestaShop + Sylius merger. This is the moment to evaluate whether this direction suits you.

You can probably skip if…

1. You’re hunting for clients at all costs This isn’t a B2B trade show. It’s a professional event where network quality trumps quantity.

2. You have no connection to the PrestaShop/Sylius ecosystem You might feel a bit out of place. EO2S owns its specialization.

5 Questions to Ask Before You Go

If you’re attending EO2S 2026, here are the questions I encourage you to ask the speakers:

  1. What is the precise roadmap for PrestaShop + Sylius convergence? We want concrete details, not promises.
  2. How will the PrestaShop module system evolve? Will my current modules still work in 3 years?
  3. What does “digital sovereignty” actually mean for a merchant? Beyond the rhetoric, what are the tangible benefits?
  4. How will community governance be structured? Who decides, how, and with what transparency?
  5. What is the timeline for mandatory e-invoicing? Dates, penalties, exemptions — everyone needs clarity.

Practical Info

EO2S — Ecommerce Open Source Summit

  • Date: March 26, 2026
  • Venue: Le Nida, Issy-les-Moulineaux (Paris)
  • Doors open: 8:30 AM (coffee + networking)
  • Tickets: €30 — shop.friendsofpresta.org
  • Organizer: Friends of Presta (non-profit association)
  • Expected attendance: ~150+ professionals
  • Hashtag: #EO2S2026

Conclusion: The Verdict

If you are:

  • PrestaShop / Sylius developer → technical sessions, networking, roadmap
  • E-commerce merchant → e-invoicing roundtable, barometer, partner solutions
  • Agency / vendor → ecosystem, prospecting, competitive benchmarking
  • IT decision-maker → digital sovereignty, open source vs. SaaS

EO2S 2026 has something for you. And at €30, it’s probably the best value-for-money e-commerce event of the first half of 2026.

I’ll be there personally. The program more than justifies the trip, and the atmosphere of an event where the PrestaShop and Sylius communities meet for the first time since the merger feels like a moment not to be missed.

See you March 26 at Le Nida.

Further Resources

To go further:

A debrief will be published within 48 hours of the event with key announcements and speaker slides.

Questions Fréquentes

When and where is EO2S 2026 taking place?

EO2S — Ecommerce Open Source Summit — takes place on March 26, 2026 at Le Nida, Issy-les-Moulineaux (Paris). Doors open at 8:30 AM for coffee and networking. Tickets at €30 on shop.friendsofpresta.org.

Why is EO2S 2026 historic for open source e-commerce?

This is the first joint appearance of PrestaShop and Sylius since their merger at the end of 2025 (PrestaShop acquired by cyber_Pixel). Mikołaj Król, CEO of both projects, will deliver the closing keynote. PrestaShop powers 200,000+ active stores across 80+ countries.

What is the first-ever French CMS E-commerce Barometer?

The first French CMS E-commerce Barometer, unveiled at EO2S 2026, is the first independent, data-driven mapping of the French open source e-commerce market. Presented by Olivier Binet (PrestaShop), Christophe Vidal and Thomas Rayrat (Friends of Presta).

How is e-invoicing addressed at EO2S 2026?

A dedicated roundtable, moderated by Marie-Sophie Cuinet (VP Category Management, PrestaShop), brings together Atoo Next and OpenSI to break down legal obligations, open source solutions, and concrete steps toward e-invoicing compliance.

Who is Mikołaj Król in the PrestaShop-Sylius merger?

Mikołaj Król is the CEO of both PrestaShop and Sylius since the end-2025 merger following PrestaShop’s acquisition by cyber_Pixel. He will deliver the closing keynote at EO2S 2026 — his first public address to both communities gathered together.

What is the ticket price for EO2S 2026?

Tickets are set at €30 for the full day, including sessions, workshops, networking, and the welcome coffee. Available at shop.friendsofpresta.org.

Who organizes EO2S and what are FOP Days?

EO2S is organized by Friends of Presta, a non-profit association founded in 2021 with 1,000+ Slack members. Formerly FOP Days, the event changes its name to symbolize its expansion to the entire European open source e-commerce ecosystem, now including Sylius.