I use the calendar that's built in my phone to remind me of my school schedules (where I need to go and when, I can never remeber that).
Other than that, I use a bullet journal. Not an app, but allows me to remeber some events and plan out schedules. There are bullet journal apps, but I prefer pen and paper.
Idk for me I don't have to remember anything. I just have to put an alarm on my phone and when it vibrates, I check it and it tells me where to go.
I also turn off all notifications on my phone except the calendar app because it would be annoying if I would check my phone and it wasn't an event that I had to attend, but that's just my opinion