Reaching Gent is super easy, get a train from Brussels (or where you are based) and in less than 1h you are there. From the Train Station you can grab a tram that drops you right in the city center. If you like walking is a 30 min walk from the station to the main square of the city. 

Under the tag Gentse Winterfeesten, Gent dressed up in Xmas Cloths decorating the city with lights, but the main action is spread out from Sint-Baafsplein, along the Botermarkt and Klein Turkije to the end of the Korenmarkt.