I did a large format workshop with Jamie Wilson in New Brunswick in which I learned quite a bit, but I don't think that he offers those any more.

I have also done Bruce Barnbaum's 'Complete Photographic Process' workshop which has a little bit of everything in it. I took the workshop primarily to learn better darkroom skills - and I did get that, but there was also quite a bit of discussion on every aspect of photography from setting up the camera, composition, calculating exposure, processing negatives and printing. It is a week long workshop in his home/studio outside of Seattle, WA. There are field trips to shoot where you get one on one help from Bruce. I would highly recommend Bruce's workshops, but warn you against his sense of humor - if you can't handle bad jokes............