The most famous marathons are traditionally held on one singular day, but the 2027 TCS London Marathon Double has been announced to help change this for the first time ever and for one year only. The event update will see the iconic London Marathon expanded into a two-day event that will host 100,000 participants over two days. The doubling of the marathon will still see all runners able to enjoy the same iconic route that stretches from Greenwich to Westminster.
The 2027 TCS London Marathon Double event will allow a record number of runners to take part in the marathon and has seen 1.33-million runners enter the ballot. Eager runners who entered will be randomly drawn in early July to find out if they've got a spot.
Two-Day Marathon Events
The 2027 TCS London Marathon Double Will Host 100,000 Runners
Trend Themes
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Multi-day Mass Participation — Expanding single-day endurance events into multi-day formats creates new capacity models for high-demand experiences without changing the core route or brand identity.
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Lottery-based Event Access — Record ballot demand highlights the potential for smarter allocation systems, tiered entry products, and data-driven participant engagement around oversubscribed live events.
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Scalable Urban Race Formats — Large cities gain a framework for hosting bigger athletic gatherings through operational designs that distribute crowds, infrastructure pressure, and tourism spending across longer windows.
Industry Implications
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Sports Events — Marathon organizers can reshape legacy race formats by using extended schedules to increase participation, sponsorship inventory, and global media attention.
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Travel and Tourism — A two-day running event supports longer visitor stays, broader hospitality demand, and destination marketing tied to major participatory sports experiences.
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Event Technology — Digital registration, ballot management, crowd analytics, and participant communications become more valuable as mass events scale to unprecedented entrant and attendance levels.