Phangan Earthworks
Earthen Hand
Wiser Earth
Permastructure
Wabisabi
EarthbagBuilding.com Workshop page
GreenHomeBuilding.com Workshop page
Year of Mud Natural Building Workshops
EarthbagHouse.com
These sites also have workshops on bamboo, adobe, cob and other natural building methods, as well as permaculture courses. Please leave a comment if you know of other upcoming earthbag workshops.