The 100th Thornbury parkrun is due to take place tomorrow.
More than 3,000 people have completed the 5km course at the Mundy Playing Fields since the event was first held almost exactly four years ago.
In July parkrun returned to Thornbury after an absence of 659 days, as a result of the coronavirus pandemic and also bad weather leaving the course waterlogged towards the end of 2019.
With no significant rainfall expected ahead of Saturday morning, as many people as possible are being encouraged to take part and help celebrate the milestone.
"We've been asking people to come and celebrate with us in their own way," said run director Jim Constable.
"Fancy dress, bring a friend, introduce someone new to parkrun, volunteer or just run."
The event starts at 9am on Saturday and you can walk, run or jog.
You do not need to register in advance but will need to do so if you want your time and stats to be recorded.
Register at parkrun.org.uk/register
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