My daughter and her husband are to leave for Rome in a week and then join us in Milan. They just got emails from the museums they had reservations in that they will have to have a Green Covid-19 certification (Green Pass or equivalent certificate) for entry now. They are panicking and wondering if should cancel trip (they do have refundable airline tickets and hotel). I have told them CDC card will suffice.
But does anyone know anything more official than my interpretation of "equivalent certificate" that actually indicates what is considered "equivalent"? Of course, then you still could have the problem of the guards at museums allowing entry, especially since this is just starting as they arrive.