Tomorrowland returns to De Schorre in Boom, Belgium across two weekends in July — July 17-19 and July 24-26, 2026 — and the headline isn't a setlist. It's a debut. Calvin Harris, after a decade of pointed and very public absences from the festival, plays Tomorrowland for the first time in his career. The Scottish producer's first-ever set at the festival is, by itself, the kind of cover-story moment that Tomorrowland tends to engineer once a year. The fact that this year it's stacked alongside a top-bill that includes David Guetta, Martin Garrix, Armin van Buuren, Hardwell, Fisher, and John Summit puts the 2026 Belgian edition in real contention for the most stacked single-festival lineup the modern EDM era has produced. The CONSCIENCIA theme. Tomorrowland's 2026 edition runs under a banner — "CONSCIENCIA" — that the festival has built around what its press materials describe as "bridging generations, genres, and global sounds." That reads, in practice, as the production team's signal that this is a back-to-the-mainstage year. The Sunday-of-Weekend-1 trance run is rebuilt. The Cherry Moon "Tribute to Belgium" set across the weekend honors the country's foundational role in early-90s European dance music. A new Afro-house stage joins the existing 16-stage layout — the first new stage addition since the Cave debuted in 2022. The headliner bill. Beyond Calvin Harris's debut, the upper bill is the densest American-and-European mainstream-EDM crossover Tomorrowland has assembled in years. David Guetta plays both weekends. Martin Garrix returns fresh off his EDC Las Vegas 2026 peak-hour mainstage set. Armin van Buuren — who closed kineticFIELD at EDC at sunrise just six weeks before doors here — anchors the trance arc. Hardwell, in his Belgian-festival return year, is on Weekend 1. Fisher brings the house mainstage moments that the festival's Friday-night slot is built around. John Summit, in his first Tomorrowland mainstage appearance after years of side-stage bills, has been bumped to the upper tier. Dimitri Vegas & Like Mike — the Belgian duo whose Tomorrowland history is inseparable from the festival's own arc — return with what is rumored to be a 90-minute extended slot on the closing Sunday. Chase & Status anchor the Saturday-night drum-and-bass run. NERVO have a high-profile slot the festival has kept quiet about specifics on. Sebastian Ingrosso brings a deep-house set the bookers have been pursuing for three years. Sara Landry, Indira Paganotto, and Miss Monique take the techno and melodic-techno upper bill — the depth chart is loaded across every subgenre this festival programs. The format. Two weekends. 500-plus artists. 16 stages. The festival's traditional Friday-night mainstage open hits at 18:00 local both weekends. The Sunday-night close is the most-watched livestream slot in electronic music, and the 2026 edition is rumored to feature a previously-unannounced surprise headliner segment in the final two hours — a Tomorrowland tradition that has, in past years, included Daft Punk-era reunions and one-night-only b2b billings. We will be tracking the rumor cycle as it builds. Two weekends, two crowds. The fundamental question Tomorrowland answers differently than EDC Las Vegas is who gets to be in the room. Weekend 1 and Weekend 2 are functionally separate festivals — different ticket pools, different attendees, the same lineup. The festival's commitment to running the bill twice means that 600,000+ attendees across the two weekends get the same headliner billing. That scale, sustained across two consecutive weekends in a Belgian field town, is what has kept Tomorrowland the dominant European dance-music event for two decades. How to attend. Worldwide ticket sales for Tomorrowland 2026 closed in late February — both weekends sold out within hours, as they have every year since 2014. Resale through the festival's official Trustpilot-verified Ticket Resale platform remains the only legitimate aftermarket. Travel bundles via Global Journey are sold separately and remain available in select-tier rooms. Daily passes are not offered. How to watch from home. The Tomorrowland One World Radio livestream — the official broadcast that runs across both weekends from the mainstage — is free on YouTube and Tomorrowland.com. Past years' streams have peaked at 5 million concurrent viewers during the Sunday-night close. The 2026 stream begins Friday July 17 at 18:00 CEST and runs through Sunday July 26 at 02:00 CEST. Rockstarr Media will be on the ground for Weekend 1 with daily mainstage reviews from De Schorre, set-by-set coverage of the Calvin Harris debut, and a CONSCIENCIA theme breakdown. Weekend 2 coverage will be syndicated from the official livestream. Bookmark the news feed. Doors open Friday July 17. The mainstage hits its first opener at 18:00 CEST. Calvin Harris's set slot has not yet been confirmed publicly — we'll update the article the moment it drops.