Here are the future meetings:
2015 Summer Meeting, July 25-29 (University of Maryland, College Park, Maryland)
2016 Winter Meeting, January 9-12 (New Orleans, Louisiana)
2016 Summer Meeting, July 16-20 (Sacramento, California)
2017 Winter Meeting, February 18-21 (Atlanta, Georgia)
Here are the recent past meetings
2015 Winter Meeting, January 3-6 (San Diego, California)
2014 Summer Meeting, July 26-30 (Minneapolis, Minnesota)
2014 Winter Meeting, January 4-7 (Orlando, Florida)
2013 Summer Meeting, July 13-17 (Portland, Oregon)
2013 Winter Meeting, January 5-9 (New Orleans, Louisiana)
2012 Summer Meeting, July 28 - August 1 (Philadelphia, Pennsylvania)
2012 Winter Meeting, February 4-8 (Ontario, California)
2011 Summer Meeting, July 30 - August 3 (Omaha, Nebraska)
[I didn't make it to Omaha, Philadelphia, and New Orleans.]
Early bird registration is early-Nov for the Winter Meetings, late-May for the Summer Meetings.
Deadlines for contributed talks and posters in early-September for the Winter Meetings, early-March for the Summer Meetings.
Registration is roughly $400+ for members, add another $200 for non-members... the students rate is about $50.
Of course you have to factor in travel and lodging and food.
Visit
http://www.aapt.org/Conferences/meetings.cfm for updates.
https://twitter.com/search?q=#aaptwm15
https://www.facebook.com/AAPTHQ
http://www.aapt.org/Conferences/WM2015/upload/final-program-12-23-14-2.pdf