A Penny Farthing cycled around Island Gardens Park as the history of the site was celebrated with the unveiling of a plaque dedicated to founder Will Crooks.
About 400 east Londoners gathered on the Park Yard where Tower Hamlets Mayor John Biggs officially revealed the granite monument.
Organised by residents’ group Friends of Island Gardens, it gave a community thumbs up to the 120th anniversary of the site and the hard work of its founder - a prominent politician, trade unionist and campaigner against inequality.
The milestone moment was part of a wider fun day which also included balloon magicians, cupcake stands and bike marking by police officers.
Former Tower Hamlets councillor and group vice chairman Gloria Thienel said: “This is the fifth event we have held and now we have two plaques in the park.
“It went extremely well and we have had lots of new members sign up
“We are extremely proud we could do it and be part of it and we will continue to fight for the gardens.”