Have you been learning German for a while? Then you probably know Hueber Verlag, the well-known German publishing company specializing in materials for learning German and other languages. Last year I have found out, that there is an advent-related contest going on on their website. It is in a form of an advent calendar. Starting on 1st December there appears one new question each day. If you answer it correctly and in time, you have a chance to win a particular prize for that day. The questions are in German. They are a fun way how to learn new vocabulary and a couple of new facts, too. Last year's topic was Christmas. This year it is anniversaries of famous people. For more information concerning the contest, read the official website.
You still have a chance to participate in this year's advent calendar contest here.
If you want to use the old ones from previous years for improving your German, there they are:
2013, 2012, 2011, 2010, 2009, 2008.
Their drawings are so cute. I am really glad that they left all these calendars online.