I usually tell my friends that if it doesn't beep, I will forget. And that's for everything, including food in the oven!
So I put everything in my calendar app. I use the Google calendar, because I use Gmail, and I can add/edit stuff from both my laptop and my phone.
My days are usually: morning = work, lunch, collect kids in school, some housework (one task a day is as much as I can fit in), and afternoons are split between my kids classes and some Bible studies that I run. I have it all down in my G calendar, and for my kids to know what day it is, I have a white board on the kitchen wall with the "normal week" tasks/activities. Both my app and my board are Color-coded, because I'm very visual, so each child's activities (classes, birthday parties etc) are written in a different color marker, and so are mine and my husband's. So when there's something out of the usual routine, even the kids notice (they are great accountability partners btw!)
Oh, and the app gives me reminders (it has to beep, otherwise I'll forget!) about 30 min before each commitment, then I have time to pack a last-minute bag and leave
I realized that I am great at making to do lists. Like breaking down tasks and dividing them into smaller processes. But I'm rubbish in following my own lists So I realized that the calendar and the reminders help.
I also have a OneNote Notepad, so I can scribble quick notes, or even take note of what I have done already! And make some to-do lists that I hope I will follow