In China we saw the story of the Monkey King, as I write this months later, I don't remember much aside from it was the story of new years. But, I do remember it was hot sitting in the sun and the actor was sweating a lot. But you wouldn't have known it from his performance, it was excellent. Very lively and passionate.
To find out about show times check the times guide for Epcot. If would not be possible to see all the shows in one day, but they are often spaced that you could see 2 or 3 in a row. There was not much seating at the spots where the shows are done, so be prepared to stand or sit on the ground for the show.
I do think these are a nice way to learn about holiday traditions, the shows are typically only about 10 minutes, well performed and even the ones revolving around Christmas talk about traditions that may not be celebrated by all Christians. My suggestion would be to see at least one or two that are non-Christmas related, so as to branch out and learn about a whole different culture.
This year I hope to see a few more of these shows.