Tens of thousands are expected to attend the Put it to the People march in London today.
Protesters seeking a referendum on the final Brexit deal will once again descend on the capital.
Up to 700,000 people were estimated to have attended a similar march in October – a rally organisers said was the biggest demonstration of its kind.
Here’s everything you need to know:
Why is the march happening?
Organised by the People’s Vote, Britain for Europe and Open Britain, the Put It To The People March will demand that the public be given a final say on the Brexit deal.
They say the debate needs to be taken out of parliament and into the streets.
Where is it taking place?
Starting on Park Lane near Marble Arch and Bond Street tube stations, marchers have been asked to begin gathering at midday.
An hour later, they will begin heading down the east side of Hyde Park to Green Park, before making their way around the top of St James’s Park to Parliament Square.
For people with accessibility requirements, a shorter route on the march will start at Trafalgar Square.
How do I get there?
The nearest tube stations are Marble Arch on the Central Line, or Bond Street on the Central and Jubilee Line.
The nearest fully accessible stations for those starting at Trafalgar Square are Westminster on the Circle, District and Jubilee Line, and Charing Cross on the Bakerloo and Northern Line.
For those coming from further afield, railway engineering works are planned at London’s Liverpool Street, Bristol, Uckfield, Lowestoft and Three Bridges, as well as some other routes around the capital.
Around 200 coaches will be travelling from places across country. One set off from the Scottish Highlands on Friday evening and another will leave from the Cornish town of Penzance at 3.15am.
When will the march finish?
After a number of speeches in Trafalgar square, proceedings are expected to finish between 2:45 and 3pm.
How many people will be there?
While the organisers will not speculate, they said the number of people who have pre-registered on the website is “significantly higher” than the numbers for the October march.
However, they stressed that the weather will be a factor on whether people decide to attend.