The Duchess of Cornwall will be joined by celebrities including Tom Hiddleston, Julie Walters and Andy Serkis for the final of BBC Radio 2´s 500 Words creative writing competition at Shakespeare's Globe.
She is due to present prizes to the winners at an event that will feature performances from One Republic, All Saints and Foxes.
Celebrity guests will read out the winning competition entries live on air during Chris Evans's Radio 2 breakfast programme.
Camilla was an honorary judge of this year's competition, while other judges were authors Malorie Blackman, Frank Cottrell Boyce, Charlie Higson and Francesca Simon, with Chris Evans as chair.
She is expected to attend a reception for the winners and readers where she will also meet Children's Laureate, writer and illustrator Chris Riddell, who will be illustrating the winning competitors' stories.
The 500 Words competition asked children aged 13 and under to compose an original work of fiction under the word limit to promote literacy among young people and encourage them to explore their creativity.