To mark International Women's Day, CARE International is organising a march for gender equality.
There will be warm-up entertainment from 11am.
The event begins at 12 noon with a welcome from Helen Pankhurst.
Performers and speakers include Billy Bragg, Beth Orton, Bianca Jagger, Sadiq Khan, Annie Lennox, Emeli Sande.
The march across Tower Bridge will form up at about 1.20pm.
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