A Tagathon sees children wearing two Velcro 'tags' take part in a variety of games and activities with the goal of collecting as many tags as possible from fellow participants.
Each event encourages participation, physical activity and interaction between pupils from different schools and sits perfectly with the Foundation's aims to inspire London's communities and enhance people's lives.
Assisting on the day were Super League players Louie McCarthy-Scarsbrook, Chris Melling and Danny Ward, as well as 12 volunteers from Goldman Sachs' Community TeamWorks programme.
Community TeamWorks is Goldman Sachs' signature volunteer program that allows each employee one day away from work to volunteer on a team-based project with a non-profit organization.
Harlequins star McCarthy Scarsbrook said afterwards:
"One of the great things about the Harlequins Rugby League Foundation is it encourages participation in all sorts of activities, not just rugby. It was fantastic to see so many children tearing around and having fun for such a good cause."