Princes William and Harry, and Duchess Catherine will attend a Heads Together event at the London Eye on Monday (10.10.16).
The royal trio will visit London's Southbank to mark World Mental Health Day by speaking at the reception and meeting people who have provided support for those who have required it.
A tweet on the Kensington Palace Twitter account read: "The Duke and Duchess and Prince Harry will celebrate #WorldMentalHealthDay with a special @heads_together event @TheLondonEye on 10 October"
William, Harry and Catherine will also have a ride on the Eye, which will turn purple to mark World Mental Health Day, with some of the people they have spoken to.
This year's theme is all about thanking those who have helped others as part of the initiative's #Thereforme social media drive.
A Kensington Palace tweet read: "The theme of #WMHD2017 is the value of 'psychological and mental health first aid for all', an issue TRH will explore with @heads_together"
This comes after Catherine admitted she and William "wouldn't hesitate" in getting their two kids, Prince George, three, and 17-month-old Princess Charlotte, support if they needed it.
She recently said: "Throughout my work with family and child support organisations, one thing that has stood out to me time and again is that getting early support for a child who is struggling to cope is the best possible thing we can do to help our children as they grow up.
"Knowing this, both William and I feel very strongly that we wouldn't hesitate to get expert support for George and Charlotte if they need it."