Hi there,
I'm coming to Het Kasteel very often and I can say it's pretty relaxed the concerts don't start at nine. You have some time to get to Het Kasteel and to get a drink and relaxe with some good music by the DJ's. The DJ's are specially selected to fit the music of the concert, so it will bring you in the right mood.
So I don't understand what all the talk is about, you really don't want them to start at nine because before you know it the lights go on and you standing outside in the cold. Make it a nice evening, listen to some music, get a great concert and go home setisfied.
So the doors open at 21u, and Amaran start at 22:15u. That gives you some time when your train is delaid or when you have birthday before the concert. And when everybody is in, the metal can begin.
Everybody, have fun tonight!