Camilla will be making her first trip to Papua New Guinea, Australia and New Zealand, in a private or public capacity, when the royal couple's Jubilee tour begins on Saturday.
Charles, a seasoned traveller, has visited the southern hemisphere nations many times.
He represented the Queen at Papua New Guinea's independence ceremony on September 16, 1975.
In a message to the country's Prime Minister Peter O'Neill and the Governor General, Sir Michael Ogio, sent last month, he said:
"We are both greatly looking forward to experiencing the wonderful, culture and hospitality of Papua New Guinea, which I remember so well from my previous visits all those years ago."
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Colo became a mother of three, grandmother of 16, great-grandmother of 12 and great-great-grandmother of three.
The district's director of homeland security has said officials are planning for 800,000 to 900,000 people to attend the ceremony.
The Supreme Court is set to decide on whether disabled travellers are legally entitled to have priority use of wheelchair spaces on buses.