"We are confident that there will be huge demonstrations against Trump wherever he visits", said Chris Nineham, of the Stop the War Coalition, which is helping to stage the so-called "carnival of protest".
Mr Trump is spending little time in the capital during the four-day trip, meeting Theresa May at her country residence Chequers and the Queen at Windsor Castle before heading to Scotland, where he is expected to hit the golf course.
"The president knows this country probably better than any president in recent history", Ambassador Woody Johnson told reporters in a briefing call Friday.
LONDON-A pub in west London will temporarily rename itself the "Trump Arms" to honour President Donald Trump's visit to the UK.
After an overnight stay at the US ambassador's London residence, Mr Trump on Friday will join Mrs May at an undisclosed defence site to view the UK's "cutting edge military capabilities" and integrated UK-US military training, before they head to Chequers for talks.
Among the forms of protest: A balloon depicting Mr. Trump as a baby wearing a diaper is expected to be flown over London while he is visiting.
The US President is due to arrive on Thursday afternoon (July 12), straight from the North Atlantic Treaty Organisation summit.
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She said: "We are a free and open democracy, and we believe in the right to peaceful protest".
Robbins said it was also "really noticeable that he will barely spend any time in London" - perhaps to avoid the protests.
Shortly after his inauguration in January 2017, Trump was offered an official state visit to the U.K. However, plans for an official state visit have been put on hold after reports that protests would erupt should he visit.
"We're looking forward to making sure the president has a chance to see and experience the United Kingdom beyond London and the South-East", said the Number 10 spokeswoman.
Opposition lawmakers, backed by an online petition signed by almost 1.9 million people, called on May to cancel the state visit offered when she met Trump in Washington after his inauguration in January previous year.
The monumental 18th-century country house, built for the first Duke of Marlborough as a reward for his military victories, was the birthplace of Sir Winston Churchill, a personal hero of the president. "When we invited not one but two Presidents of China, we were prepared to overlook the fact that China is effectively a police state", he said.
They will then go to Scotland later on Friday and spend the weekend there before leaving on Sunday for a summit with Russian President Vladimir Putin the following day in Helsinki.
Mr Johnson said trade would be high on the agenda for bilateral talks between Mr Trump and Mrs May at Chequers next Friday. In a crowdfunding request, they wrote that they want the balloon to shadow the president, "haunting the skies - and hopefully the dreams - of the stain on the office of President that is Donald Trump Senior".