After attending a ceremony at the memorial in Lower Manhattan, the royal couple is scheduled to visit a Harlem nonprofit, the New York Public Library's main branch and Christie's.
King Charles III and Queen Camilla are expected to kick off their trip to New York City on Wednesday with a wreath-laying ceremony at the 9/11 Memorial & Museum, as the royals continue their four-day state visit to the United States.
The morning ceremony in Lower Manhattan, set to include Mayor Zohran Mamdani and other officials, will commemorate victims of the Sept. 11, 2001, terrorist attacks. The royals are expected to meet with victims' families.
British officials said the trip was planned to allow the king and queen to spend time outside the nation's capital. Charles spent the first two days of the trip in Washington, where he emphasized the durability of U.S.-British ties despite recent strains over the war in Iran. He met privately with President Trump, addressed Congress and attended a state dinner.
In his speech to Congress on Tuesday, Charles noted that NATO had invoked Article 5, which commits member states in the alliance to collective defense, to help defend the United States after the Sept. 11 attacks. He also said that the United Nations Security Council had been "united in the face of terror."
"We answered the call together -- as our people have done so for more than a century, shoulder to shoulder," he said, citing conflicts from the world wars to Afghanistan.
That reference was part of the king's effort to underscore the value of the trans-Atlantic alliance at a time when Europeans have increasing doubts that Mr. Trump remains committed to NATO and its collective defense pledge.
After the Sept. 11 event on Wednesday, Charles is expected to visit Harlem Grown, a nonprofit in Upper Manhattan that oversees community gardens and teaches children about urban farming, sustainability and nutrition. He will also attend a U.S.-British trade event.
Separately, Camilla is expected to visit the New York Public Library's main branch for a reception and a panel hosted by Jenna Bush Hager, a co-host of NBC's "Today" show. The panelists will include novelists Harlan Coben and Min Jin Lee.
At the library, Camilla will also meet with representatives of domestic violence charities and tour a permanent collection that includes teddy bears believed to have inspired English author A.A. Milne to write children's books featuring character Winnie the Pooh.
The royal couple's day in New York is scheduled to end with a reception at Christie's, the British-founded auction house.