What is the proper procedure for recommending that an old question be retained as being of historical (and continuing) interest despite its clearly not satisfying current site standards for research by the poster?
I have seen some very old questions marked with a boilerplate blurb to the effect that the question has been granted special exemption against closure because it is of historical significance (which may involve, in some cases, an unresearched question that drew excellent answers).
But how does a site participant nominate an old question—and in particular, an old question that has been closed or is in danger of closure—to be "marked with a historical flag"? Do I flag a question for moderator attention and then specify that I'm requesting that EL&U's "historical question" blurb be added to explain why a question with (let's say) no sign of research is open when more-recent, similarly unresearched questions are being closed?
A case in point is this recently closed question: Is it "bear" or "bare" with me? The question was asked on August 18, 2010, and the poster shows no signs of having done any research at all. On March 6 of this year, it was closed for lack of research. But in the intervening 5½ years, the question has accumulated 125 upvotes, and the succinct but authoritative accepted answer (which cites a "common errors" reference work) has received 224 upvotes.
On the one hand, the question clearly does not pass muster by current EL&U standards. But on the other hand, the large number of upvotes and the huge number of page views (1,096,414) strongly suggest that people are interested in the question and have found it (and the answers to it) useful. When I ran into it in the Review queue, I voted to reopen the question because of its established record of interest to site visitors (it remains closed as I write); but what I would really like is to see it granted an exemption from the site's current Q&A standards.