The event was posted onto Facebook by the Momentum campaign group, in the wake of the resignation of a large number of Corbyn’s shadow cabinet. In the hours after the event, thousands of people have said that they will be at the event, which begins at 6pm.
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Shadow chancellor John McDonnell and Diane Abbott – both high-profile supporters of Corbyn’s leadership – are to speak at the event. Other high-profile Corbyn allies such as journalist Paul Mason and trade unionists will also speak at the event.
It is being supported by a hashtag campaign that urges people to tweet with #KeepCorbyn.
Those behind the event have said that it is a reaction to what they see as a right-wing takeover of the Labour party, against the wishes of its membership.
“The future is uncertain,” reads a message on the event’s page. “We face a Tory Brexit, Cameron has resigned and we are likely to have a general election in the coming months with the potential of Britain lurching yet further to the right.
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“A small number of Labour MPs are using this as an opportunity to oust Jeremy, disrespect the Labour membership who elected him and disregard our movement for a new kind of politics.
“We cannot let this undemocratic behaviour succeed.”
The Facebook page is busy with messages of support for the protest, from people urging others to attend.
“Let's be clear this is not a small number of MPs this is the full scale right wing revolt,” writes one user. “The PLP is again treating Labour membership with complete contempt.”
But others have written on its wall to support those MPs who have been sacked or have resigned in protest at Mr Corbyn’s leadership. “No point in leading a government for the people if your peers do not support you,” writes one user.
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