I hear about large format workshops out in the western states like California but there is nothing here in St. Louis. The camera clubs here are mostly filled with digital shooters. I don't know what Minneapolis is like.
There are some Community Colleges that still teach film and large format. You might check that out.
APUG is great but there is another forum that you might be interested in also. It's called Large Format Photography Forum. It's all about large format photography of course. Check it out and click on the Home Page for a wealth of free information. Quite a few of us APUG members belong there also (me included).
Also google Ken Lee photography. Besides Ken's beautiful photography, he has a tech page that you may find very useful. Ken is a moderator on Large Format Photography forum and a great guy.