Christmas school play :(

I had to postpone my theory test till next week as my son school play has been brought forward. I am a little peeve to say the least as I was not told this on any memo. I missed out on the tickets for the show. I can't even go and watch the show. Its a small school. I would have to be sitting twiddling my thumb waiting for a ticket cancellation but i wouldn't want to be anywhere else than be there for my son. Of course if I regularly helped the school I would get the first chance to know about the tickets. This is the perks if you don't help out. :(