More than 250 people gathered in Stamford's Red Lion Square to show their support for a new skatepark.
Stamford Skatepark Committee organised the gathering in less than 48 hours, using mainly social media sites Twitter and Facebook.
The group then walked to the site of the proposed new skatepark at the Recreation Ground.
Committee member Jeremy Ball said: "We started organising the event on Friday at 7pm and more than 250 supporters - of all ages - turned out at 4pm today.
"We wanted to show South Kesteven District Council (SKDC) that a lot of people in Stamford want a skatepark.
"It was a huge crowd and fantastic support.
"If we had had two weeks to plan, we would have had three times as many turning up."
BBC East Midlands Today is scheduled to broadcast a report on today's events at 10.15 tonight.
Mr Ball said the committee is now urging people to attend SKDC's development control committee on October 16th, when the Recreation Ground application is due to be reconsidered.
It was submitted by Stamford Town Council on behalf of Stamford Skatepark Committee back in February – but a decision was delayed because of conflicting noise impact reports.
The original seven-year-old wooden skatepark, which attracted up to 60 skaters a day, was taken down in 2008 after it was deemed unsafe.
The new concrete skatepark, which is also suitable for BMXers and roller bladers, has been designed by Maverick Industries, which would also construct the facility.
Stamford Skatepark Committee has been trying to get the replacement built since 2008. It has raised £150,000 for the new facility, which would be managed by Stamford Town Council.