I remember when I was younger there was this witch movie I always liked but could never find it again. It was about a witch school with all girls and I think a woman headmaster and some famous witch rocker guy (I think he was a witch) was coming to perform at the school?? And the girls were really excited, and all had a crush on him. Then I remember a scene on a hill or something around a fire with 3 witches. It's been a while... it had to have come out in the mid/late eighties I'm thinking, maybe early nineties. Any idea?

If you're in the UK Cupcake, then I would say it was "The Worst Witch".
There was a movie where the school was visited on the night of Halloween by the "grand warlock" played by Tim Curry (Pennywise the Clown in the movie "It").