Modular Summit gathers the modular infrastructure ecosystem in Lisbon on September 15 and 16: Celestia, EigenDA, rollup teams, shared sequencing protocols, and the application chains building on them, with around 2,000 attendees. It is the most technically concentrated single-topic event of the European fall, and deliberately so.
One thesis, deeply explored
Every session assumes you know what a rollup is. The agenda covers data availability sampling economics, proof system trade-offs, interoperability between rollups, sequencer decentralization, and the unit economics of running application-specific chains, delivered largely by the people who maintain that infrastructure rather than analysts describing it secondhand.
If you are deciding where to deploy an appchain, comparing DA layers, pricing blob space into a business model, or building tooling for the modular stack, these are the highest-value two days you can book. The mid-sized format means everyone relevant is reachable in a hallway; there is no VIP layer between builders and the core contributors whose GitHub commits everyone depends on.
Lisbon context
Lisbon remains Europe's most comfortable conference city for crypto teams: reliable October-style sunshine even in September, a large resident Web3 community, competitive accommodation, and an airport connected to every European hub. Side events cluster around the city center within rideshare range.
Timing puts the summit adjacent to European Blockchain Week Barcelona the following day, so teams doing a European circuit commonly chain Lisbon, Barcelona, and Zurich into a single week.
Technical depth expectations
Come prepared to discuss specifics: blob throughput numbers, proof latency trade-offs, sequencing revenue models. Speakers expect informed questions and hallway debates run rigorous, with Celestia researchers, EigenLayer contributors, and rollup SDK teams accessible in proportion to the event's deliberately capped size.
Lisbon's Alfama and Baixa districts host most side dinners, and the city's famous custard tarts fuel more protocol arguments than anyone admits. Registration tiers sell predictably since capacity stays intentionally limited; modular ecosystem veterans book the moment tickets open, and first-timers should study recent data-availability pricing proposals beforehand to keep pace.
The summit's Lisbon home reflects Portugal's emergence as a European Web3 hub, combining favorable tax treatment for crypto income under specific regimes, a resident international builder community, and quality-of-life advantages that retain talent. Modular Summit anchors a Lisbon blockchain calendar including year-round meetups and adjacent ecosystem events, letting attendees extend stays productively. Previous editions produced notable announcements: DA layer integrations, rollup framework releases, and shared sequencing partnerships frequently debuted here precisely because the audience contains every stakeholder whose coordination such launches require. First-time attendees should review prior recorded talks; the content assumes cumulative familiarity with modular discourse.
Previous editions sold through quickly given the deliberately capped capacity, and the announcement history alone, DA integrations, sequencing partnerships, rollup releases debuted here, justifies watching official channels for ticket windows. Bring questions with numbers attached; vague queries get vague answers here.
Lisbon's September light makes the conference's outdoor breaks genuinely restorative, and the capped attendance ensures coffee lines double as protocol debates rather than dead time between sessions.
Follow the organizers' announcement channels closely: prior editions used them to release technical primers before doors opened, letting attendees arrive conversant rather than cramming during Lisbon evenings.