Sorry I didn't post sooner. I completely forgot I would report back. The violinists absolutely had no problems bringing them on board. I would definately carry the guitar, they get pretty rough with the luggage. Someone already said no problem with the baton in luggage, and I agree.
The talent show was a definite highlight to my kids' week. They had made so many friends that they all came to see them dance. It's funny, they would never do it before and now they are talking about doing it next time and what they will do. Everyone was good, but there was varying amounts of good there

The violinists were all really enjoyable, except we did kind of zone out after about 5 minutes. She played a full 10, and, while amazing, it got repetitive and boring. There was another violinist who played a medly of Disney tunes that was really enjoyable. She also played with 3 sisters, and that was really fun.
Two singers were absolutely star quality. The third was ok, but it was harder to hear her. The first two mentioned were obviously well trained, the third was more of a karaoke singer, but lots of stars have started that way, it seems. There was an adult who did a magic trick with a rope who was really good.
Now, a previous poster said that when you signed up it was first in the book, first up. It didn't work that way for us. My kids were the second in the book. They called them up last of the night. They also varied where the violinists were so that they weren't back to back, which was nice.
Another thing to note, if either of them use music to accompany their act,
DCL has the capability to hook up an iPod, which is way more convenient than CDs for those of us who use one. IPods don't skip, scratch, break and are playable on virtually every system as long as there is a patch cord. DCL has one.
Any other questions, feel free to ask.