Thousands attended the Finsbury park event last year
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UK rapper Sway and rock band Neils Children will send out a defiant anti-racism message when they perform at an east London show on Saturday.
Rise East, at the Dagenham Town Show, comes a day ahead of the main Rise: London United festival in Finsbury Park, north London.
Both events are backed by mayor Ken Livingstone who said fighting racism was a "political priority" for London.
The Hollies and Liberty X were also due to perform at the Dagenham show.
'Wonderful diversity'
Thousands of people are expected to attend the free annual Rise festival in north London, on Sunday, where acts such as Jamelia, Kelis and Saint Etienne will be performing.
Mr Livingstone said: "London's success depends on the international character of our city and London's fortunes are tied up with our stand against racism and prejudice.
"Linking up with the Dagenham Town Show this year will mean many more Londoners can come together to for a great day out, demonstrating that they reject the politics of hate."
Dagenham MP Jon Cruddas said: "As well as being a great day out it provides a fantastic opportunity to celebrate the wonderful diversity of our city.
"It sends out powerful messages too - that we are happy and proud to live in a multicultural city and that racism will not be tolerated in our communities."