What is an annual Christmas tradition celebrated in towns across Europe: in France, Germany, and Austria? 
Christkindelsmärik, Strasbourg: Christkindelsmärik is a Christmas market (French: "Marché de Noël") held annually in Strasbourg, France, near Strasbourg Cathedral. Christmas market: A Christmas market, also known as Christkindlmarkt, Marché de Noël, Christkindlesmarkt, Christkindlmarket, Christkindlimarkt, and Weihnachtsmarkt, is a street market associated with the celebration of Christmas during the four weeks of Advent. Christmas market:  These markets originated in Germany, but are now being held in many other countries. Christmas market:  In Austria, Vienna's "December market" can be considered a forerunner of Christmas markets and dates back to 1298.
Christmas market