Every year you can visit "Brussels winter wonders". Most of the Christmas market is located on the St-Catherine's place. You can find all kind of craft works in the small wooden chalets. Of course, you can also enjoy nice drinks and food as well! Next to all the typical christmas shops you can enjoy a ride on the big wheel or ice-skating on the old fishing market place.
(http://www.christmasmarkets.com/Belgium/brussels-christmas-market.html)