https://www.bbc.co.uk/news/uk-45157728

quoted from BBC news article -
*When Jake O'Neill first tried to stop London knife crime by getting teenagers on their bikes, "20 to 30 people" showed up.

On Saturday, 3,000 people - mostly teenage boys - rode through the capital, pulling tricks and stopping the traffic.

Jake, 19 - also known as Jake 100 - set up the Bikestormz project with his friend Mac after his best friend's older brother was stabbed to death.

"I quite literally want people to put their knives down and pick their bikes up," Jake told the BBC.

"Hence the slogan Knives Down, Bikes Up."

Jake is from east London, where "some of his friends" were stabbed.
"It really made me think about what I could do to change things in my community," he says.
"We wanted to bring young people together, take them off the streets and give them something uplifting to do."
He thinks riding together makes violence less likely. "They've never been in a fight whilst riding their bikes," he says.*