You can define events in Options > History then log them in the HISTORY area. I also suggest people not remove old events or replace existing with updated info but add new events as they occur to keep a history.
Click here for documentation.
Yes, I've read that documentation forwards and backwards.
I found the Options/History area years ago, and filled it in.
But I have searched for the 'History' area the documentation mentioned but cannot find it. It's not in the main menu or the menu right below it.
However, I finally found where to enter the data: It's an icon that looks like a green sheet with a clock, and when you hover over it it says 'Log anything with an expiration such as Medicals ...'. I was looking for an icon that said 'History' when I hovered over it, and I missed the 'Log anything...' text several times that I checked.