A small demonstration is expected to take place near Blenheim Palace in Oxfordshire on Thursday, the venue for Trump's black-tie dinner with May on Thursday evening.
Nearly all of Trump's activities will be outside the city: He'll meet the Queen at Windsor Castle, not Buckingham Palace.
Trump will arrive in Britain on 12 July for a "working visit", a more sober affair than the original plan for a state visit with its customary pomp and pageantry after it drew threats of mass protests.
Iranian girl detained for posting dance videos , twitter erupts with outrage
Another person, Masih Alinejad , posted a video of herself defiantly dancing in a public park in Tehran. Last Friday, she and other detainees, whose identity could not be confirmed, appeared on Iranian TV.
On Tuesday, Trump left for a weeklong Europe trip that includes a meeting with Russian President Vladimir Putin in Finland and the North Atlantic Treaty Organisation summit in Brussels.
He will meet Theresa May at Chequers before joining the Queen at Windsor Castle on July 13.
On Wednesday, the Guardian newspaper reported "the United Kingdom police mobilisation for Trump's visit would be the largest since the 2011 English riots", when London was shocked by five days of violence and unrest, with wild scenes of looting and arson, met by mass deployment of 10,000 police.
The Trumps will also pay an off-camera visit to a British defence site outside of London.
Earlier this year, organiser Leo Murray launched a crowdfunder to pay for the project, reaching the £1,000 target in less than 24 hours.
Serena Williams loses first set, but reaches Wimbledon semifinals
Serena Williams , who lost a set for the first time at this year's Wimbledon , came back to win the final two sets 6-3, 6-4. Bertens will play 13th seed Julia Goerges for a place in the semi-finals after the German beat Croatia's Donna Vekic .
They will then spend the night at the American ambassador's residence in Regent's Park, Winfield House.
In what will likely plunge the already fraught US-UK "special relationship" into further doubt, the US Embassy in London has felt the need to warn its own citizens over upcoming protests against Donald Trump's visit this week.
After the North Atlantic Treaty Organisation summit, Trump will head to England, where Prime Minister Theresa May's government is in turmoil over her plans for exiting the European Union.
Protesters will also hold a "Carnival of Resistance", holding stalls, talks and music against the US President.
Four more boys safely out as day two mission ends
The 12 boys, part of a youth soccer team known as the Wild Boars, first went missing with their coach more than two weeks ago. The rescued boys were being treated by medics at the field hospital, and were later airlifted to a larger nearby hospital.