From February 22-26, 2010 the GNOME community will hold a Usability hackfest in London, England.
As GNOME 3.0 approaches, a usability focused hackfest is overdue. This hackfest will provide the GNOME Usability team an opportunity to focus, set goals, and accomplish work to prepare the GNOME community for the GNOME 3.0 transition and the future.
The event will be held at the Canonical offices in London, England. The address is as follows:
27th floor, 21-24 Millbank Tower
London SW1P 4QP UK
This location is near Pimlico Station (which is on the Victoria line) and Westminster Station (which is on the Jubilee and District and Circle lines).
More info at the event website.