Names including Stephen Fry, Graham Norton and Sandi Toksvig will take the stage to share their thoughts on the world's bigger questions at this year's Hay Festival.
The 30th annual event invites writers and thinkers from around the world to share their ideas and expertise on everything from science and technology to art and film.
The programme of 800 events also includes appearances by Brian May, Will Young and Amy MacDonald, and comedy from Eddie Izzard, Mark Watson, Marcus Brigstocke and Shappi Khorsandi.
The 10-day event in Hay-on-Wye will see broadcaster Fry share his philosophy on how to bring about a better world as part of the festival's central 30 Reformations programme.
Norton, Sir Tony Robinson, Sheila Hancock, Ken Loach and new Great British Bake Off presenter Toksvig will also lead conversation events.
Meanwhile, artist Tracy Emin and writer Germaine Greer will join discussions investigating the latest topics in art, technology, history and health.
Some visitors to the festival, which runs from May 25-June 4, will also see a Letters Live event with surprise guests.
There will also be a range of activities aimed at families and younger visitors, including an appearance from acclaimed children's author Jacqueline Wilson.
Tickets for the Hay Festival will be available for purchase online from Thursday.