No, mom, this is not the only time in 824 years December has 5 Saturdays. Please stop forwarding those emails.
From LOTR Project: "Very soon a lot of people will be glóin to the Hobbit: An Unexpected Journey. However, there are 13 dwarves and many will not have seen them bifur. I don't want people balin on seeing the movie so here is a cheat sheet."