If you come to Chiang Mai, you could perhaps take some classes at Studio Naenna. I spent several days learning how to warp and weave on a backstrap loom- you can read about my experience on my blog:
http://tribaltrappings.blogspot.com/2009_10_01_archive.html [scroll down to the bottom part of the page]. Studio Naenna's website is:
http://www.studio-naenna.com/ - contact them to see what they could offer in August. I thoroughly enjoyed the class and gained a new respect for all the work that goes into producing a handwoven textile.