On our recent Fantasy cruise the "extra" tickets were handed out at the Port Adventures desk.Head to Guest Services as soon as you board and ask them for tickets. I was told they were sold out, but when I headed to Guest Services there were a handful of tickets available.
awesome, thank you for all the replies everyone. gives me hope. once i board, i'll be sure to head over to the desk and request for it and i'll keep checking daily. my daughters would love this, we missed out on our last cruise. i told them we can always go to the parks for this but of course it's a different experience on the cruise for our princesses. thanks everyone! have a magical day!