Walt,
As far as my shop goes, it is so cluttered up that I am embarrassed for anyone to come over. Actually I wouldn't mind, but personally, I would appreciate prior notice.
I have learned quite a bit of stuff from going to some of the trade shows where there are quite a few makers. Gun shows for instance, are sometimes a good place where quite a few makers may be with a booth or display area. I don't know where you live but there are quite a few knife shows around the country. If one is close by, go to one. Don't worry about asking questions. Most knifemakers are pretty good folks and are more than willing to help with any questions. You could probably learn as much there as you could going to their shop unless you were interested in seeing the equipment they are using.
In my experience, I have found only three subjects to stay away from. They are religion, politics and heat treating. If you stay away from those, you'll be fine.
(That is stated with tongue in cheek, of course)
CLWilkins