Annual Clare Hall Ashby Lecture - plus other series of lectures and talks, some of which can be open to the public. Enquire about attendance.

Darwin Lecture Series 'In the second term of every academic year since 1986 Darwin College has organised a series of eight public lectures. Each series has been built around a single theme, approached in a multi-disciplinary way, and with each lecture prepared for a general audience by a leading authority on his or her subject ... The Darwin College Lectures are very popular, each attended by around 600 people, so you must arrive early to ensure a place. Stewards at the door follow a strict Admissions Policy to ensure fairness. An adjacent overflow theatre (with live TV coverage) is provided for those who cannot be seated in the main hall.'

'Audio and selected videos of the Darwin lectures are available on: iTunes U; the Streaming Media Service. Darwin College Lectures books are available from Cambridge University Press.'

'Trinity College hosts a number of Public Lectures, which take place on a regular basis (usually either annually or biannually) ... The lectures are open to all, with no ticket required.'