Read or skimmed most, but not all, of the thread.
At ds' primary school, teachers are in by 8 and are usually still there at 6. I have often gone in to Parent Council meetings (Scotland: they are a sort of cross between a PTA and a School Board, without the powers of a School Board - which in Scotland, they never really had anyway) which start at 6.30 and found the teachers eating the lunch they didn't have time to have. These are the teachers who are giving up an evening to participate in the Parent Council becasue they see the partnership with parents as important.
I also know that they already do extra "twilight* training: but that the INSET Days are an opportunity to get speakers in or officials/specialists in from the Scottish Government providing direction on how to implmenet the new Curriculum for Excellence. These are big and importnat topics that can't be done in little slivers in the eveing.
When I worked in the private sector I often went on training courses: almost without exception, they were during the day. If they were far enough away, and lasted more than day, then I would be expected to stay overnight, yes - but it was rare I would have to work in the evening (except thet I usually had to try to keep up with the "day" job).
Last night was the School's Halloween Party: all the teachers (and some of the parents) were there helping until 9pm. We didn't have time to fully finish tidying up (becasue the janitor finishes at 9 on the dot
) so the headteacher said she would be in extra early to do it. That's on top of her 13+ hour day yesterday.
Our Out of School Club does cover for INSET days, so we don't have a problem there. Although it takes place in a school premises, it has totally separate staff and is run a charitable company limited by guarantee. Dh used to be its Chairman - which in itself used up a lot of hours (getting its finances back on an even keel) - and the servcie risks going down the tubes again, 'cos the new parent members on the Board don't seem to realise that they have to put the hours in to manage it.
But that's beside the point: when I was small (back in the 60s
), out of school care didn't exist. Working mums weren't so common then, but they did exist. I can remember friends of my mum getting her to help out - not for any remumeneration other than babysitting. Mum was a student so was therefore more able to help out during the holidays - there was a stronger sense of people helping each other then, is my impression. It also "helped" Mum to have kids around for us to play with. (Maggie T's comment, "There is no such thing as society" was a self-fulfilling prophecy :()
We didn't/don't have family in this country so we relied on a netwrok of friends for support.
School isn't a free child-minding servce: when people have kids they need to factor in, and budget for, how and when they will be cared for.
It does sound as if the OP's school could perhaps have ben better at communicating with "new start" parents. As someone else said, maybe she didn't realsie that an INSET Day, even if she was told about it, meant that the school would be shut to pupils.