Actually, it's a funny question right?
So, other people have been invited to school X, and you haven't heard anything.
This means that a- you aren't even in the acceptable pile, b- you are a back up (waitlist), c- dude who was supposed to notify you hasn't gotten to it yet.
This means that if you contact them, they will a- ignore you, b- tell you to chill, c- tell you about your invite.
So, what is the worst that could happen?
In the off chance that you are rejected - you are letting them know that you care, maybe this will remind them who you are. Future colleague is still someone you may work with in the field at some point.
In the off chance you are waitlisted - you are letting them know that you care, maybe this will set you ahead of the other waitlisters.
In the off chance you are already in but not notified yet - you are letting them know that you care, this will make them feel good about the choice they made about inviting you.
Having just written this post and thought about it, I think I will go ahead and do this, once enough time has passed that I know I'm not invited.
Of course, just a bunch of guessing.