"New details about the Royal Windsor Horse Show have just been announced. Lady Louise, daughter of the Earl and Countess of Wessex, will drive her late grandfather’s carriage during the show in recognition of her grandparents’ contributions to the world of equestrianism.

The late Prince Philip took up the sport of carriage driving after he stopped playing polo, becoming a major contributor to the development of the sport. His granddaughter has grown up sharing the love of the sport and inherited his carriage and ponies following his death last year at the age of 99.

The Queen’s great-grandchildren will appear at the final night of the Royal Windsor Horse Show in tribute to their great-grandmother’s Platinum Jubilee. Roya Nikkhah, the royal reporter for The Sunday Times, revealed that Prince George, Princess Charlotte, Prince Louis, Savannah Phillips, Isla Phillips, Mia Tindall, Lena Tindall, Lucas Tindall, August Brooksbank and Sienna Mapelli Mozzi will appear in a horse-drawn carriage in the show finale during a section called ‘A Gallop Through History’ that celebrates The Queen’s reign and love of horses."

That's all going to be so special for HM.

https://royalcentral.co.uk/uk/special-roles-for-lady-louise-and-the-queens-great-grandchilden-revealed-at-jubilee-horse-show-176216/