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A nice site by "Deutschland Tourismus" for you to check out:
http://www.deutschland-tourismus.de/test/eve_main_dchristmas_1_d.htm
If you want to find out more about German Christmas customs go to Deutschland Tourismus. You will find a list of Germany's Christkindelmaerkte (markets) and other information related to the "Adventszeit." This page is entirely in German.