@MamaGhina I recall it being a military operation. I had a concertina folder with days and months for the forms by term 1 in reception. In the days before PayPal and WhatsApp groups I kept five fivers and 10 £1 coins to hand. It got better once I was chair of the PTA and got the head to produce a termly events calendar with notice for costumes! That was a whole other rabbit hole.
World Book day nearly broke me. DS insisted one year he wasn't dressing up. Changed his mind at bedtime. One option - Mowgli, in an old pair of ripped shorts and smeared with dirt! He didn't put pants on and one of the rips was near the groin so spent all day stopping his willy from escaping. That was my fault. He was about 7!
My piece de resistance however was leaving someone else's child at the gate and realising two miles away from school. Never have I driven so fast over London road humps 😀
By the time ds was 9 I had them at different schools in opposite directions. By the time he was 10 I was back at work full-time, and got an au-pair. She dealt with the shit or if she didn't it was her fault, not mine and I strolled in at 6.30pm after activities and tea time.
The thing is, if you forget, and it's inevitable, it also means you care, else there would be nothing to forget.