parkrun (http://www.parkrun.com/) is a not-for-profit organisation established in the United Kingdom in 2004 to provide a free, weekly, timed 5km running event to every community that wants one.
There are now 170+ events around the world with more than 15,000 runners participating every Saturday morning.
The parkrun record is 14:00 set by Craig Mottram on 10 June, 2006.
Events are organised by local volunteers with support from parkrun.