The Free Software and Open Source Symposium is to be held October 24 in Toronto. From their site:
The Symposium is a one-day event aimed at bringing together educators and other interested parties to discuss common free software and open source issues, learn new technologies and to promote the use of free and open source software in our classrooms, labs and educational infrastructure. At Seneca College, we think free and open source software are real alternatives.
The deadline for proposals is August 31.