I really feel for you OP, this is a culture clash if ever there was one.
DH is Russian, so I’m on a Facebook group for Russian mums in London. And it’s full of this sort of thing:
”Girls [posts always start with “girls” 😁], first day of school tomorrow, are we supposed to take something in for the teacher?”
”Girls, Anya was invited to a friend’s house, am I suppto stay/go, bring anything?”
”Girls, school runs something called the Duke of Edinburgh scheme - suggesting DC join - anyone know about this?”
And so on.
If you’re English, none of these things will likely incite anxiety because you’re familiar with them. If you’re foreign, it can be very difficult.
And fwiw Slavic people generally are incredibly warm once they open up to you, which is a big contrast to the “hello over the garden fence first, maybe a Christmas card in year 4” style of many English people. It is difficult.
I hope this thread has given you some useful insight.