Can I sign up everyone in my group (our reservations are linked) or does someone from each storeroom have to appear in person?
I was just on the Fantasy, not the Wonder, and for us, Meet and Greet and character breakfast sign-ups were at the Port Adventures desk. I was able to sign up for both my room and my mother-in-law's, as we were linked together.
Just a little more info that you might find helpful:
Keep in mind that there are some events -- for us, the Disney Junior character breakfast -- that require a ticket per person, and others -- for us, the Princess Gathering and Anna and Elsa Meet and Greet -- for which one ticket covers the whole stateroom.
The tickets are definitely required for entry; there is a crew member who checks them before you get in line. For the Princess Gathering, we showed up a little early and they let us into the (already fairly lengthy) line. For Anna and Elsa, the crew member would not let us in until our assigned time.
My mother-in-law and my son, who was listed under her stateroom, opted to go to a magic workshop instead of the character meets, so we gave their stateroom ticket to the crew members policing admission, in the hope that someone who might have wanted to get in line but didn't have a ticket might get it. I hope we sprinkled a little magic pixie dust on someone's cruise!
