With help from the WoW Forums, this list of symposiums is reproduced here in the hopes that everyone will find something in their area in 2010:
Jan 15-17 Florida Symposium
Jan 29 Tennessee Association of Woodturners
March 26-28 Turnfest 2010, Queensland, Australia
March 27-28 Totally Turning, Saratoga Springs N.Y
April 23-35 Southern States Woodturning Symposium
Gainesville, Ga.
May 6-8 Utah Woodturning Symposium
June 18-20 AAW Symposium , Hartford, Conn
June 14-17 Australian Woodturning Symposium
July 17 Mini-Symposium, San Diego
Aug 20-22 Turn-On Chicago
Aug 27-29 SWAT Southwest Association of Turners
Waco, TX
Sepember 10 - 12 West Coast Round-up, Vancouver, BC
Mid-September 12th Rocky Mountain Woodturning Symposium
Loveland, CO
Sept 17-19 Ornamental Turning Symposium, San Jose, CA
Sept 17-19 Turning Southern Style, Helen, GA
Oct 23-24 2010 Virginia Woodturners Symposium - A Hands-On Event, Fishersville, VA
Nov 11-14. Segmented Turners Symposium
Arrowmont in Gatlingurg, TN
Nov. 21-23 Turners Anonymous, Pittsburgh
Feb 18-20, 2011 Desert Woodturning Roundup, Mesa, AZ.
While I don't think this list is complete, feel free to add new or corrected info.