I did go on Equinox in August. It wasn't advertised. Upon embarkation, I asked a maitre d' to please include me, if held. It was held in the private room in Murano. On Summit, it was held in the back of Tuscan. On Equinox the apricot souffle was prepared properly, gluten-free (only egg-whites to hold it together). On Summit, they included wheat in its preparation. They've never been able to prepare a souffle for me on M-class, but that's how they're all prepared in Murano. Must be the ovens on S-class vs M-class. Don't know about E-class.
LuAnn, Veuve Clicquot dinners have been around at least since Edge's inaugural. They're $200+ per person. You have to ask, in person, as a rule. It did appear later on the app on one or more of my Nov/Dec Summit cruises, as I recall. Don't remember if it was clickable, though.