Anti-Brexit campaigners will march through central London this weekend to "say no to Boris and yes to Europe".
Protestors will take part on the March for Change to demand an end to Brexit as they call on Mr Johnson to stop "hurtling us towards the cliff edge".
Activists hope to send a clear message to the Tory leadership frontrunner with a "Donald Trump-style" blimp set to fly over the heads of marchers.
Here's all you need to know about the March for Change.
London People's Vote march: In Pictures
When is the March for Change?
The march will take place at 12pm on Saturday, July 20.
What is the route of the March for Change?
Campaigners are being told to meet at Park Lane for midday. The meeting point is next to the Hilton Hotel.
After meeting at Park Lane, campaigners will then march to Parliament Square where a number of speakers will be heard.
If you're travelling on the London Underground, the nearest Tube stations are Marble Arch on the Central line or Bond Street, which is on the Central and Jubilee lines
But if you are coming from further afield, coaches have been booked to take people into London from all corners of the UK.
Is there a map?
There is, and it is here.
What celebrities and parties have signed up to take part in the march?
Singer Billy Bragg, presenter Sandi Toksvig and Gavin Esler have all signed up so far, along with Caroline Criado-Perez and Ayesha Hazarika.
Other supporters include the Lib Dems and the Green Party along with Best for Britain and Women for a People's Vote.
Why is the March for Change happening?
Mr Johnson is the favourite by some margin to replace Theresa May as Prime Minister next week, and organisers say they're marching now to "make it clear to Boris Johnson that we want to stop the Brexit chaos".
Campaigners say that more focus needs to be placed on the NHS, schooling and affordable housing instead of resources being put towards Brexit.
They add: "This is a national emergency. We won’t put up with a hard Brexit PM being imposed on the country and hurtling us towards the cliff edge.
"We can only solve the big global challenges - from climate change to terrorism - by working with Europe and the rest of the World.
"We can build that better tomorrow through the most successful peace project in history.
"No to Boris. Yes to Europe."
