There are also Winter Meetings as well as regional meetings.
http://www.aapt.org/Events/calendar.cfm
Here are the future dates of the National Meetings:
Winter 2008, Jan. 19-23 (Baltimore, MD)
Summer 2008, July 19-23 (Edmonton, Alberta)
Winter 2009 w/AAAS, Feb 12-16 (Chicago, IL)
Summer 2009, Dates TBD (Ann Arbor, MI)
Winter 2010 w/APS, Feb 11-18 (Washington, DC)
Here's my contribution to the blog about the Summer 2006 AAPT meeting in Syracuse: https://www.physicsforums.com/blog/2006/07/30/aapt-syracuse-2006/