Gotta have your phone with you all the time for that. I have a little paper calendar that I use. That's as close to organized as I'll ever be. Funny thing is that I had one of those PDA things about 15 years ago, and I thought it was the greatest thing ever. Except it wasn't around when I needed to know what I had just agreed to do. Plus, the paper one doesn't break when you drop it, doesn't stop working when it gets wet, and is faster to update with scribbles instead of poking at little things on a screen. It's all part of being a completely unreconstructed neolithic man.
My paper notebooks don’t work so well when they are wet
LOOK at that!!! 2 perfectly good necks just waiting to happen!