Anti-Trump protesters lined the roadway leading to the palace near Oxford - but it's unlikely the Trumps even saw them.
The black-tie dinner was hosted by Prime Minister Theresa May, with other attendees including newly-appointed Foreign Secretary Jeremy Hunt and his wife Lucia, and business leaders from firms including Blackstone, Blackrock, Diageo, Mclaren and Arup.
Speaking in Brussels as he wrapped up a contentious North Atlantic Treaty Organisation summit, Trump shrugged off concerns over demonstrations, saying he had "great friendships" in Britain, where his mother was born. Mr. Trump has been a keen supporter of Brexit and on Thursday he appeared to echo those concerns.
"The president of the United States of America will regretfully have the red carpet rolled out for him by this Conservative government", Ian Blackford, the Scottish National Party's leader in the Westminster parliament, told lawmakers on Wednesday. "Britain is going to have to look right around the world for allies with which to do trade deals".
"Everyone agreed to raise spending as they agreed in 2014, and everyone agreed to respect the [previous] commitments they made", French president Emmanuel Macron said.
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. While saying that he didn't have any message or advice, he added: "I would say Brexit is Brexit..."
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"I'd like to see them be able to work it out so it could go quickly", he said.
The demonstrations come ahead of a mass protest scheduled to begin at 2:00pm on Friday in central London, and dozens of other actions against Trump-amounting to what the Stop Trump Coalition and Stand Up to Trump have dubbed a "carnival of resistance". Mr Trump is hardly likely to catch a glimpse of the six metre giant orange inflatable blimp that depicts him as a screaming baby.
A giant baby Trump blimp is set to fly over London during the U.S. president's visit to the UK.
Lance Price, who served as former Prime Minister Tony Blair's media adviser, told the Independent that no matter what the American convoy contends, the fact that Donald Trump is avoiding London points to a moral victory for the protesters.
A high metal fence has been erected around the United States ambassador's central London residence where Trump will spend Thursday night. Melania Trump has heard about the plans and isn't excited about her husband's presidency being see as a 'joke'.
She will then head to Windsor Castle for tea with Queen Elizabeth II in the afternoon. Protesters also have plans to follow Trump to Scotland where they plan to fly the blimp near Turnberry while Trump is in town.
Trump and May are expected discuss Russian Federation ahead of the president's meeting with President Vladimir Putin on Monday.
Yet according to David Wemer of the Atlantic Council, a new U.S. -U.K. trade deal isn't a high priority for the Trump administration.