The Joomla! Project is tentatively planning a developer conference that will take place in New York City this December:
Experienced Joomla! developers, go to this site to indicate your interest in this conference. This conference--and possible future conferences--will only be held if the Joomla! community expresses interest in it. And you can't beat the cost (tentatively planned for less than $100/ticket). There's a form at the above URL that you'll need to complete to let them know that you're planning to attend.
Lisa Kirschner,
Founder and Managing Director, Flair Interactive Services Inc.
Managing Editor, Content 911