Ms Dynamite was the star of a celebratory gig at The Scoop amphitheatre on Saturday attended by 800 people.
The event at The Scoop next to City Hall was staged to say thank you to Thames21's young Waterway Champions who have volunteered to help clean up London's waterways.
More than 1,000 young people have volunteered with Waterway Champions since 2008.
"It's amazing that young people care enough about the planet we live on to give their time and effort to make it better," said Ms Dynamite. "We should all take a leaf out of their book."
• The More London Free Festival continues this week with comedy drama I'm a Londoner.