I am going to Namur, Belgium in about 3 weeks and want to score some weed!

So I am going to Namur, Belgium in about 3 weeks together with my class for a school trip. I searched online and found out that it is normal to smoke weed in Belgium, and since I'm a regular smoker I became quite happy. But when I searched I didn't find where to buy weed in Namur. I figured that you need a local plug to buy and since I'm not from Belgium I need to find my own. Can anybody help a fellow smoker