This sounds like the school or teacher's attempt to retaliate and turn things around to make everything look like his fault. I assume you haven't gotten anywhere with the principal so far in terms of understanding your concerns? With people/schools like this, the more you complain the worse it's going to get. It's a no-win situation. And doesn't he have ADHD? They expect him to be at an assembly at the right time on his own? DD9 can't even find her shoes half the time. Basically they are punishing behaviors that result directly from a disability (and that's assuming someone told him he had to notify the teacher and he didn't).
