Update (23 June): below is an unedited video of the blue plaque unveiling ceremony.
On Saturday 23 June a blue plaque will be unveiled to commemorate the mathematician Alan Turing. The ceremony will take place on the grass in front of the college at 3.30pm, and speeches will be given by Professor Les Valiant, Professor Martin Hyland and the Mayor of Cambridge, Sheila Stuart.
Les Valiant was himself a student at King's and is now Professor of Computer Science and Applied Mathematics at Harvard University. He has made an enormous contribution to theoretical computer science, a contribution that was recognised in 2010 when he won the prestigious ACM Turing Award (see the news story).
Martin Hyland is Head of the Department of Pure Mathematics and Mathematical Statistics (DPMMS) at the University of Cambridge, and is a Fellow of King's.
Please note that members of the public are not allowed on the grass but can watch from the pavement. You can also watch a live stream of the event on this page at 3.30pm on Saturday. You will need Adobe Flash Player 9 or above to play the live stream, which you can download for free from the Adobe website.
Turing was both a student and Fellow of King's, and the blue plaque ceremony falls on the centenary of his birth. The ceremony is part of a year-long series of events to celebrate Turing's achievements in mathematics and early computer science. For more Turing-related events throughout 2012 see the Turing Centenary website.
The blue plaque will eventually be mounted on the front of the college near King's Passage.