The Duke, Duchess, and Prince Harry will all speak at the event, as well, before taking a ride on the London Eye with those who have shared their mental health first aid experiences. The London Eye will light up in purple later that day to show support of World Mental Health Day. Other buildings around the world will also be lit up in purple for the worldwide movement of ending the stigma around mental health. The ‘light up purple campaign’ was set up in memory of Canadian teenager, Amanda Todd. You can read more information about the campaign here.