Parkrun has confirmed that it will launch its first event in the Caribbean, with a weekly 5K starting at Festival Green in Camana Bay, Grand Cayman, on 29 August. The Cayman Islands will become the first Caribbean nation to host the free Saturday-morning run, extending a global footprint that now takes in some 2,800 locations worldwide. For an organisation that began with thirteen runners in a London park in 2004, it is another marker of how far the idea has travelled.

The announcement lands in a summer of milestones. Over the weekend of 13 and 14 June, parkrun staged its millionth event, a cumulative total built across more than two decades of Saturday runs and Sunday junior events on five continents. Founder Paul Sinton-Hewitt reflected that a million events was never in the plan when he organised that first gathering in Bushy Park, and the scale of what has followed remains difficult to grasp even for those inside the organisation.

The individual milestones keep pace with the institutional ones. Last month Darren Wood became the first person to complete 1,000 parkruns, a streak of participation stretching back through the event's entire history and a reminder that the format's genius lies in its repeatability. Parkrun's own registers now count more than 400,000 regular participants across its adult and junior events, supported each weekend by tens of thousands of volunteers, the quiet infrastructure on which the whole enterprise rests.

The Cayman launch is emblematic of where parkrun's growth is now coming from. With the United Kingdom, Australia and much of Europe close to saturation, recent expansion has pushed into new territories, and organisers hope a Caribbean foothold will open the door to neighbouring islands. The Camana Bay course, flat and sociable and finishing amid the development's cafes, has been chosen with the parkrun ethos in mind: this is a community event first and a race a distant second.

For the wider running boom, the timing is apt. Race entries from the world's largest 10Ks to big-city marathons are at record levels, and parkrun remains the broadest base of that pyramid, the place where a substantial share of new runners take their first timed steps. A million events on, the model shows no sign of exhaustion, and on 29 August a few dozen runners gathering on a green in Grand Cayman will quietly extend the streak.