The march will begin at the BBC in Portland Place and proceed to Trafalgar Square, where a rally will take place.
Meanwhile, Theresa May's government is nervously anticipating disruption from the guest himself.
Just before departing for Europe earlier this week, Trump ruffled feathers again by saying that the United Kingdom was in "turmoil", referring to the resignation of two prominent Cabinet ministers protesting Prime Minister May's Brexit policy.
"It's an insult", Farage, a former leader of the UK Independence Party, said.
"Boris Johnson's a friend of mine, he's been very nice to me, very supportive and maybe I'll speak to him when I get over there".
Trump arrives in Britain on Thursday after the North Atlantic Treaty Organisation summit in Belgium and will stay overnight at the central London residence of the US ambassador where a high metal security fence was erected outside.
10 Downing Street said she would be meeting with schoolchildren and veterans on Friday, accompanied by Philip May, U.K. Prime Minister Theresa May's husband.
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Organizers now say they hope to take the blimp on a "world tour", following Trump on his global diplomatic engagements.
FILE PHOTO: United States ambassador to the Court of St James Woody Johnson speaks during a press preview at the new United States embassy building near the River Thames in London, Britain, December 13, 2017.
On Brexit negotiations: Not convinced by the UK's handling of the talks, Trump said he would take a "tougher" approach with Brussels.
The blimp's appearance in central London was approved by the Greater London Authority, and Mayor Sadiq Khan has defended the decision, saying it is not for him to be a censor or to decide what is in good or bad taste.
Thousands will take to the street to condemn the arrival of the leader of the free world, while a giant baby blimp will mock the United States president from the sky.
Equally, she said people have a right to protest against policies they do not agree with.
Unlike visits from previous presidents, he won't be spending much time in London after his arrival.
Winfield House is the only place where Trump will spend time in central London, where demonstrators are expected to gather in their tens of thousands for a march on Friday afternoon, hours after a giant "Trump baby" balloon is flown near the UK Parliament in an eye-catching stunt.