The World Road Running Championships in Copenhagen on 19 and 20 September will be the largest running event Denmark has staged. Alongside the 496 elite entrants from 85 federations, organisers expect roughly 65,000 mass-participation runners across the weekend, with the half marathon on the Sunday accounting for 35,000 of them and the 5km and road mile absorbing the remainder.
The dual-format model is the reason the championships exist in their current shape. When World Athletics rebuilt the old World Half Marathon Championships into a three-distance event in 2023, the explicit aim was to put amateur fields on the same closed roads and the same timing system as the professionals on the same day. Copenhagen is the first host to attempt it at this scale, and the numbers are closer to a major city marathon than to a traditional championship weekend.
The course is a large part of the appeal. The Copenhagen half marathon route is flat, wide and closed to traffic throughout, running past Christiansborg and the Black Diamond library, and it has a long record of fast times for elite and amateur fields alike. For a 35,000-runner field that combination matters practically as well as competitively: width determines how quickly waves can be released, and a flat profile keeps the spread of finish times narrow enough for the roads to reopen on schedule.
There is a logistical question that no host has fully answered yet. Running a world championship and a mass event on the same course within hours of each other means elite athletes warm up in a city already full of amateur runners, and it means the surface, the fluid stations and the barriers have to be reset between fields. Copenhagen has staged a 25,000-runner marathon in May and a long-established autumn half marathon, so the operational base exists, but the combined weekend is a step up from either.
For World Athletics the strategic case is straightforward. Road running is where the sport's participation growth is concentrated, and championships that only feature professionals reach a shrinking audience. Whether tying 65,000 recreational entries to a global title event strengthens the championship or simply borrows a city marathon's crowd for a weekend is the question Copenhagen will answer, and future hosts are watching.