Civil liberties campaigners, leading politicians and musicians will join a huge march today to protest at the Government's handling of the refugee crisis.
Organisers of the event in central London said tens of thousands of people are expected to take part, with a number of refugees leading the march to Parliament Square.
Musician Billy Bragg, civil liberties campaigners Shami Chakrabarti and Bianca Jagger, Liberal Democrat leader Tim Farron and Green Party leader Natalie Bennett are among those expected to address protesters.
The protest is backed by organisations including Amnesty International, the Syria Solidarity Movement and Stand Up To Racism.
Kate Allen, director of Amnesty International, said: "This is a critical moment ahead of the EU leaders meeting on Monday to make our voices heard loud and clear.
"We should remember the proud moments in the UK's history when we have opened our doors to people when they are most in need, and we should not be turning our backs now on those caught up in what has become the biggest refugee crisis since the Second World War."
Bianca Jagger, president of the Bianca Jagger Human Rights Foundation, said: "My heart goes out to those seeking refuge in Europe. We should never forget that our Government's misguided policies and illegal military interventions have played a critical role in causing this humanitarian crisis."