US Presidential candidate Mitt Romney, who was chief executive of the 2002 Winter Olympics, will be attending the Olympics opening ceremony during his campaign visit to London.
Mr Romney already has a strong interest in London 2012. Rafalca, the 15-year-old Oldenburg mare co-owned by his wife Ann, has won a spot on the Olympic dressage team.
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The town was where the US military and Kurdish fighters first united to defeat the Islamic State group four years ago.
MPs are expected to debate the deal on Saturday.
The duchess is expected to speak at the event, which will involve games, music and traditional Pakistani cakes.