I admit, I've never been there, but since I got my tickets, I might as well be going.
A small festival in Belgium, province of Luxemburg (not the country!) starting in 2 weeks' time.
Camping is available. (if one wants that in April?) And there is an inner stage and an open air stage.
All info (in FR, NL and EN) can be found on www.durbuyrock.be.