The Oxford Literary Festival overlaps with Cambridge (either by design or accident). It’s from 2-10 April – see http://oxfordliteraryfestival.org. So you might have to decide between light and dark blue.
Among the attractions: “Award-winning actor of stage and screen Ian McKellen takes to the Sheldonian stage for talk about his life in Shakespeare – One of our greatest actors Sir Ian McKellen is to join Shakespeare scholar Professor Sir Jonathan Bate for a discussion to mark the 400th anniversary of the death of The Bard. McKellen and Bate will discuss how their lives have been shaped by their relationship to the great plays.”
Also appearing, as stated on the website: Jacqueline Wilson, Melvyn Bragg, Joan Bakewell, A C Grayling, James Naughtie, Garry Kasparov, Maureen Lipman and Michael Frayn.