The Prince of Wales is due to visit the Royal Cornwall Show on Friday.
The Royal Diary said Prince William would attend the event at the Royal Cornwall Events Centre in Wadebridge on Friday with his aunt Sophie, the Duchess of Edinburgh.
Prince William, who is the Duke of Cornwall, is a patron of the Royal Cornwall Agricultural Association (RCAA), the charity which organises the three-day show, which begins on Thursday.
The Duchess of Edinburgh is the RCAA’s vice-president and a patron of the Association of Show and Agricultural Organisations.