Every foreign teacher has to teach a class to be observed by other people, (principal, vice principal, other teachers, maybe parents) at least once a year, it's called an "open class". Yesterday I had my open class. I was really nervous about it, but it wasn't bad at all. The day before my co-teacher and I taught the same lesson to the same class to practice. So the students had an idea of what we were doing in the class, and they behave better with other people watching them.
I only had a few observers in my class, and the principal and vice principal weren't there. We had a critique of the class afterward that was mostly positive. As far as I know this will be my only open class this year.