@jonsnowswife
We had a weeks notice about this years parents evening. One of the jobs I used to work in, say if you wanted Christmas off you'd have to book it off in June to stand a chance.
Lucky you. Most people I know have to (try to) book Christmas on January the 1st! Eleven and a half months notice they need, AND half of them won't get it.
@AccrualIntentions
And I don't assume it. Why is why I chose my specific employment precisely for those benefits. I was responding to the suggestions made by various posters that no such jobs exist or that people who thought they did have never worked a day in their lives, or don't have real jobs, or that nobody can do it.
BULLY FOR YOU 
How fortunate you were able to carefully select gainful employment that enables you to piss off to your child's parents evening/ afternoon/ 5 minute appointment, with very little notice. Not EVERYone is so lucky.
And you have the nerve to call @AndrewJames patronising?!
You win the gold medal for that!!!
@FenceSitter01
This scenario was always on of my major complaints with schools. They have no concept of people actually working in real jobs, we don't all work 8.30 - 3 with 13 weeks holiday a year. We can't all drop work immediately we are summonsed for an appointment, we have child care, work cover, commutes to arrange. parent consultation days being a particular bugbear, expected to lose a days holiday for a 10 minute appointment at 12 noon.
Stupid comments about taking random bits of leave to care about a childs education - you wouldn't be saying that to a surgeon who cancelled your operation, "cancel my operation with 1/2 an hours notice, doctor, what's that? Little Johnny's school has a random cake event and you have to turn up otherwise school sys you are a bad parent, of course I understand!! not going to happen is it. Many career teachers have never worked in the outside world, they have been in an educational environment since they were 4 years old, they have no concept of real life dynamics and juggling acts. We don't all live our life in neat 6 week parcels.
One of the best posts on here. Even though some people don't appear to like it, and what you have said in it; you are bang on with most of what you say.!
As you said, some people on here are absolutely NOT living in the real world, and they have very privileged lives! Fine, I don't care, but don't assume everyone else has!!!
@AndrewJames
If she found out after work on Friday and isn't due in until Monday, she can't ask for Monday off until Monday morning....which is zero notice to work. Impossible for most people.
Does someone need to go back to school?
Excellent point. I have no idea why you felt the need to apologise to someone who called you a 'patronising cunt.'
SHE is the one who should apologising to you.