The embassy said these demonstrations were expected to attract large crowds and cause road closures.
President Donald Trump will get the red carpet treatment on his brief visit to Britain beginning Thursday: Military bands at a gala dinner, lunch with the prime minister at her country residence, then tea with the queen at Windsor Castle before flying off to one of his golf clubs in Scotland.
July 5, 2018: The Greater London Authority and the mayor give protesters permission to fly a 20-foot tall balloon depicting Trump as an angry baby in a diaper from Parliament Square for two hours during Trump's July 13 visit.
Publican Damien Smyth is an unabashed Trump fan and came up with the idea over a few late-night drinks with a friend. "He has been welcomed like no United States president before".
"I said "If the President is coming to town I'll call it the Trump Arms", he said.
As May attempts to unify her party behind her proposals, commentators said Trump meeting Johnson would suggest backing for his view that May's plans would inhibit Britain's ability to forge new free trade deals.More news: Too early to take positives for proud England boss Southgate
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While Trump is expected to have a busy schedule throughout his visit, there is at least one place that he will avoid: central London.
American nationals have been told to be careful on the streets of London during planned demonstrations against Donald Trump later this week.
Theresa May will host Mr Trump, and his wife Melania, at a lavish dinner at Blenheim Palace on Thursday evening, just days after the USA president said the United Kingdom was in "turmoil" following the Cabinet resignations triggered by the Prime Minister's Brexit plans.
"For a USA president who retweets far-right Britain First propaganda, insults Londoners at times of tragedy, and refuses to condemn white supremacist marches at home, this insult is well deserved" said Labour MP David Lammy backing the visual protest.
Organizers of anti-Trump rallies say they are not expecting any trouble at all - and that it would be very unlikely for any hostility to be directed at ordinary Americans. Trump will travel by helicopter once there, making it unlikely he'll see protests firsthand.
"That is why I welcome President Trump's forthcoming meeting with President Putin - open channels of communication between the United States and Russian Federation are key to managing the risks of confrontation".