If you have never been or heard the carols, I strongly recommend that you try to go next year (it is already complete this year here in Utah). The songs are wonderful and I love them, but there is simply a different spirit with seeing the whole story that you can't get from listening to the songs or reading the book. I found my favorite of the carols that someone made a video of, and have posted it here as well.
I absolutely love The Forgotten Carols.