The CanLII Law, Government and Open Data Conference and Hackathon is being held 13-14 September 2013 in Ottawa, Ontario, Canada.
Remote participants are welcome. Please see the details here.
The Twitter hashtag for the event appears to be #canliihackathon
Links to live and archived video of sessions from the event are available at http://www.canlii.org/en/blog/
For slides, posts, and other selected resources related to this event, please see the comments to this post.