Pro-EU protesters are heading to London for a march near Parliament to demand a second Brexit referendum.
Hundreds of thousands of people are expected to join the Put it to the People march, including actors Stephen Fry, Keira Knightley and Lena Headey.
The march comes a few days after the launch of an anti-Brexit online petition that has gathered more than 4 million signatures from people demanding the government revokes Article 50 and remains in the EU.
However, the petition is unlikely to be acted on. A petition for a second EU membership referendum in June 2016 attracted more than 4.1 million signatures but was rejected by the government.