A statement on the Palestine Solidarity Campaign's website urged sympathisers to join the demonstration outside the Israeli Embassy.
It read: "We have come together to unite for Palestine. We have come together to unite for peace, freedom, and justice. To unite against hatred, intolerance and racism.
"Palestinians are living under a brutal military occupation... Israeli soldiers are firing live bullets at unarmed protesters and executing Palestinians in the street.
"We have come together to oppose this escalating attack on Palestinians. We welcome all who stand with us in our opposition to all forms of racism, including antisemitism and Islamophobia...
"We stand with Palestinians in their struggle for a future free of racism, colonialism and apartheid."