Since I haven't seen any mention of the event, other than that Duluth Tribune article on Elmer Engman; the Great Lakes Shipwreck Preservation Society is hosting their annual shipwreck and diving show this Saturday (March 12) in the Twin Cities. Full details are at http://www.umsatshow.org/ (Some may remember this as the event that used to be at The Mermaid some years back.)
Always a high quality event with many interesting speakers and programs.
I have no affiliation with the GLSPS or this show. Just putting the information out there for anyone within driving distance who might be interested.