Do adults have to go to the open house? My question arises... my daughter turns 13 just before the cruise, so she will be in in the edge. She will likely want to peek in the lab at sometime during the open house times with her 10 year old sister. Does an adult have to be present, or can the two of them head to the open house without me. Also, I see on the Fantasy navigator that the Edge and Vibe have open houses?? What is that???