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 ?