The Libre Graphics Meeting is an annual conference, organized by the
community, that brings together developpers and users of free and open
source software for graphics.
This year the event will be hosted by École Polytechnique in Montreal, Quebec, Canada. Three days full of activities that range from talks, birds of a feather meetings, workshops and happy mingling among participants.
To get more info check the official LGM website: http://libregraphicsmeeting.org/2011