William will present awards to recipients from across the UK, including OBEs to Wimbledon champion Andy Murray and Vicar Of Dibley producer Jon Plowman.
The Duke, 31, has recently given up operational duties with the RAF and is considering options for his "public service", sources have said.
Aides claim William is "nervous" about the cere-mony. One royal source said: "William has been practising using the sword and pinning the medals on a servant so that he gets it right. He doesn't want to slice anyone's ear off or stick a pin into their chest!"