Tom Hanks and Emma Thompson will be in the capital for the last day of the BFI London Film Festival.
The pair will be on the red carpet for the screening of their film Saving Mr Banks, the story of how the movie Mary Poppins was made.
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The 20-year-old was found fatally wounded on Roth Walk, near Finsbury Park, north London at around 3am on Saturday, Scotland Yard said.
Police have arrested a man wanted in connection with a burglary at the home of pensioner Richard Osborn-Brooks.
The rally comes after it emerged that the Home Office destroyed thousands of landing cards documenting the arrival of windrush-era migrants