The Canada Moodle Moot 2013 (February 12-15) will be using BigBlueButton to broadcast parts of its conference live to on-line delegates. You can register for on-line access here.
Fred Dixon, project manager for BigBlueButton, and Jesus Federico, developer of the BigBlueButton Moodle integration, will be presenting at the conference on Delivering on-line classes using BigBlueButton. Their presentation will also be broadcast live using BigBlueButton.