The bond between the United States and the United Kingdom runs deep.
The visit is seen as crucial at setting the course for a closer trading relationship between the two countries.
Security is still a cornerstone of the relationship, as are trade and less tangible things like shared language and the fact that many Americans are proud of their British roots.
Donald Trump, 72, is about to visit the United Kingdom for the first time since being elected president in November 2016, and the British people aren't prepared to give him a warm welcome. A giant inflatable depiction of Trump as a almost naked baby will hover above Parliament Square.
U.S. President Donald Trump checks time prior to a dinner at the Art and History Museum at the Parc du Cinquantenaire during the NATO Summit in Brussels, Belgium July 11, 2018. It will hover above Parliament Square later this week during the president's visit.
"Exercise caution if unexpectedly in the vicinity of large gatherings that may become violent", the embassy said in a list of advised actions, asking Americans to "keep a low profile" and "be aware of your surroundings".
Despite a series of diplomatic spats between Britain and Trump, the British government is hoping for a quick trade deal with the United States after it leaves the European Union.
But there are still plenty of detractors, as loudly demonstrated by a passenger in vehicle driving past the United States flag-adorned pub who shouted "F*** Trump", to which Mr Smyth chuckled.
Trump has been quick to criticize British society, telling a National Rifle Association convention in May that the British didn't have guns but had so much knife crime that one hospital was like a military war zone with its floors awash with blood, a false statement quickly rebutted by British physicians and politicians. "You need to be a part of saying no to some of these people". I'm 54 years old, we lived through pretty good times.
Donald Trump is due to arrive in London on Thursday and will meet the Prime Minister and the Queen.
Gorgeous said that they have worked closely with the Metropolitan Police and other march organisers - along with the people behind London's planned LGBTQ+ Community Centre, which are providing stewards - to co-ordinate the day.
"Drag has a particular power of making certain stuff visible", said Gorgeous.
They added that the protest was about "standing in solidarity with America".
But that could change.
Churchill spent three weeks at the White House, cementing his close ties with Roosevelt and forming the basis for future relations between the US and Great Britain.
Earlier this week, Trump said it was "up to the people" whether the prime minister stayed on after two senior Cabinet ministers resigned within hours over her Brexit policy.
"I'm certainly going to Turnberry and I'll see him there".