On 7 March 2019, the Queen hosted a Buckingham Palace event to mark the 50th anniversary of Charles's investiture as the Prince of Wales. Guests at the event included the Duchess of Cornwall, the Duke and Duchess of Cambridge, the Duke and Duchess of Sussex, Prime Minister Theresa May and Welsh First Minister Mark Drakeford. The same month, at the request of the British government, the Prince of Wales and the Duchess of Cornwall went on an official tour to Cuba, making them the first British royalty to visit the country. The tour was seen as effort to form a closer relationship between the UK and Cuba.