The first parkrun, then known as the Bushy Park Time Trial, takes place in Bushy Park, London, UK.

Parkrun is a collection of 5-kilometre (3.1 mi) events for runners, walkers and volunteers that take place every Saturday morning at more than 2,000 locations in 23 countries across five continents.

Bushy Park in the London Borough of Richmond upon Thames is the second largest of London's Royal Parks, at 445 hectares in area, after Richmond Park. The park, most of which is open to the public, is immediately north of Hampton Court Palace and Hampton Court Park and is a few minutes' walk from the west side of Kingston Bridge. It is surrounded by Teddington, Hampton, Hampton Hill and Hampton Wick and is mainly within the post towns of Hampton and Teddington, those of East Molesey and Kingston upon Thames taking the remainder.

London is the capital and largest city of both England and the United Kingdom, with a population of 8,945,309 in 2023. Its wider metropolitan area is the largest in Western Europe, with a population of 15.1 million. London stands on the River Thames in southeast England, at the head of a 50-mile (80 km) tidal estuary down to the North Sea, and has been a major settlement for nearly 2,000 years. Its ancient core and financial centre, the City of London, was founded by the Romans as Londinium and has retained its medieval boundaries. The City of Westminster, to the west of the City of London, has been the centuries-long host of the national government and parliament. London grew rapidly in the 19th century, becoming the world's largest city at the time. Since the 19th century the name "London" has referred to the metropolis around the City of London, historically split between the counties of Middlesex, Essex, Surrey, Kent and Hertfordshire, which since 1965 has largely comprised the administrative area of Greater London, governed by 33 local authorities and the Greater London Authority.