Hi Sokev, I don't know much about Belgium, but since we (the Netherlands) are really close by, I suggest (if you can read Dutch) to check www.bellydancing.nl. click on "Dansen" on the top bar, then something will scroll out which says "Agenda". There you can find a lot of workshops in the Netherlands, but occasionally it also contains workshops in Belgium and abroad.
I hope it can be of help to you.
Happy dancing, Iris
Ps. I believe there is a similar site for Belgium, but I don't know the url/web address. If I come across it, I'll be sure to post it here.
Blatant plug: I travel all over for workshops. All I need is a host. I would love to go overseas. I have many previous hosts, all over North America, who you could talk to to learn about what it takes to host a workshop, and what it was like to host me specifically.