I have been involved with The Battle of Ideas for many years. This event, run by the Institute of Ideas, is a major weekend festival of public debate that happens each October at the Barbican in London.
See the Battle of Ideas and the Institute of Ideas.
I have organised, chaired and spoken in several debates on a wide, possibly eclectic, range of themes. These include:
Extra-Terrestrial Intelligence Watch the debate here
The King James Bible
Animal Consciousness Listen to the debate here
The Future of Poetry
Monarchy and Republicanism
The Medieval World