Another PIL one sorry!!
DD is due to start school on 7th Jan. She turned 3 a few weeks ago so we’ve been making a fuss about her starting ‘big’ school etc.
PIL briefly mentioned taking DD and her cousin to the local pantomime on the afternoon of the 6th - they didn’t ask if we had plans, just told us they’d booked the tickets. Luckily we had nothing on - it’ll be the first time they have DD on their own and I was quite happy about it. However, I’ve just found out that they’ve actually booked tickets for the evening showing instead so DD won’t be getting home til 7.30pm at the very earliest 
AIBU to be extremely annoyed by this? The likelyhood is that DD will fall asleep in the car on the way home as 7pm is her usual bedtime, so our whole evening bath/bed routine is not going to happen.
I’ve told DP that he needs to tell his parents that we are not at all happy about this. I’m tempted to say she can’t go, but PIL have only just started to take a real interest in our family so don’t want to do anything to push them away. I’m so so annoyed tho!! 
