Pinax Symposion is an open-source conference management system written in Django. Symposion includes support for content management, proposal submission, reviews, scheduling and sponsor management.
.. toctree:: :maxdepth: 2 project conference content proposals sponsorship speakers schedule
Symposion came out of development done by Eldarion for DjangoCon US and US PyCon but has been independently used for a number of other conferences. The project homepage is http://eldarion.com/symposion/