Tickets for the 2016 festival weekend at the Barbican are now available at early-bird rates. See our tickets page for more information.
The Battle of Ideas 2015 festival weekend was a great success, with more debates, speakers and attendees than ever before. You can keep up to date with our latest audio and video from the 2015 festival, and be the first to know the latest news about the 2016 festival, by signing up to our newsletter.
If you would like to help us with the Battle of Ideas as a volunteer, check out our volunteering page.
Images from Battle of Ideas 2015.
Thanks to James Berry, Paul Brocklehurst, Lameya Chaudhury and Tom Fenn for the pictures.
Tweets by @instofideas
Would Britain thrive outside the EU?, Szu Ping Chan
One in seven treatments not necessary, warns NHS chief, Robert Mendick, and Laura Donnelly
Happiness: A modern malaise, Kathryn Ecclestone
Price of City away tickets is a parable for our age, Simon Kelner
Something Borrowed, Alec Wilkinson
China's economic illness is contagious for Asia, William Pesek
Race in America: The Fury of Ferguson, Economist
If You Don't Support Breastfeeding in Public, You Don't Support Breastfeeding, Katharine McKinney