I assume, from your question, that you already have a good working knowledge of color management and inkjet printing? I can't speak to fine art B&W printing workshops, but I do think highly of R. Mac Holbert of Nash Editions here in southern California. I took a 1 day fine art inkjet printing workshop with him and learned a great deal about best practices.
The reason I bring up Mac's name is because he teaches workshops around the country, most recently with the Epson Print Academy.
John Paul Caponigro is another person whose name is often mentioned in digital fine art printing. And our host, Michael, offers 1 on 1 printing classes at his gallery.
Paul