The estimable Dr. Schwab of Surgeonsblog objects, as well:
…But Grand Themes is an entirely different kettle of fish. I blog, in theory at least, because I have things I want to say. Sometimes a subject evolves from a comment or suggestion I get, which is great: it means my blog is stimulating (or so I’d like to think.) I assume that’s what motivates most of us. To turn Grand Rounds into a theme dictated by the host is entirely different and, in my opinion, wrong. Want people to write about a subject you find interesting? Excellent idea! Post a request for submissions and call it whatever you want. Just don’t call it Grand Rounds.
I seem to be in some good company.