Well it's you're lucky day! It is with a great deal of embarrassment and a dollop of courage that I present to you a video tutorial of the dance that we created at my school for Jingle Bell Rock. It's really simple so even younger primary school children can do it and the song is not baby-ish so it should suit middle and upper primary school classes too.
I was hoping that this could be something that you could put on your interactive whiteboard/projector but the video quality isn't great. I had some serious issues trying to save it as a bigger file due to storage problems. However, it still might be useful for you to learn the dance, to teach the children.
Unfortunately, due to copyright issues, I couldn't use the official track. I suggest teaching the song and using this karaoke video to help with the lyrics. Then, when they're familiar with the song, use my dance tutorial to add in the moves.
I ho ho hope you like it (I've already uploaded a video of me dancing, I don't think that cheesy line can make me cringe any more)