Couple of other ideas... look into your local historical society- they often have free lectures/seminars on things like soapmaking, harvesting fibers, herbs, tanning leather, cheesemaking, hand tools, etc. There are other guilds in most areas that have fairs or craft shows as well, blacksmithing, spinning, quilting, etc.

Also, medical knowledge is imperative. Here is a link to some free downloads of excellent references
[link to www.hesperian.org]