Maybe late in the day but the British library is holding a British Library hosts 2-day Wikimedia Editathon this friday and Saturday (14.01.11 to 15.01.11). The site says of the event:-
Wikimedia and British Library join forces to improve content relevant to the Library on Wikipedia
The British Library, home to some of the world’s unique printed and written collections, is hosting a two-day Wikipedia ‘editathon’ on Friday 14 and Saturday 15 January. Co-organised by Wikimedia UK and the Library’s new Digital Research & Curator team, the event is aimed at sharing the expertise of real-world cultural institutions with wiki-knowledge. Details about the event can be found here.