April 5-7, 2013 Writer's Digest NYC Conference (New York, NY) (http://www.writersdigestconference.com/ehome/index.php?eventid=51706&)
April 5-6, 2013 Houston Writers Guild Conference (Houston, TX) (http://www.houstonwritersguild.org/)
April 19-20, 2013 Kentucky Writers Conference (Bowling Green, KY) (http://www.sokybookfest.org/KYWritersConf)
May 4-5, 2013 DFW Writers' Conference (Hurst, TX) (http://dfwcon.org/)
May 17-19, 2013 PennWriters Conference (Pittsburgh, PA) (http://www.pennwriters.org/prod/)
May 23-25, 2013 Alberta Writers Guild Event: Words in 3D (Edmonton, Canada) (http://www.wordsin3d.com/)
June 6-7, 2013 Clarksville Writers Conference (Clarksville, TN) (http://www.artsandheritage.us/writers/)
June 7-8, 2013 Carnegie Literacy Books-in-Progress Workshop (Lexington, KY) (http://carnegiecenterlex.org/events/books-in-progress-conference/)
June 21-23, 2013 Agents & Editors Conference/Writers League of Texas (Austin, TX) (http://www.writersleague.org/38/Agents-Conference)
July 5-6, 2013 Hunt Country Writers' Retreat (Middleburg, VA) (http://www.huntcountrysuspense.com/Writers_Retreat_2013.html)
September 27-29, 2013 Writer's Digest Conference West (Los Angeles, CA) **I couldn't find any information available on this one yet.
October 18-20, 2013 Re:Write Writers Conference (Austin, TX) (http://rewriteconference.com/)
Hope this is a good starting place for you. I've been checking out some of these myself and I'm hoping to be able to attend one. Good luck!