Why not just use a web based tool and enable browser notifications?
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please name one with this. I tried microsoft to do and it didn't work. with notifications enabled. idk what else there is.
Trello, Google Calendar, Notion, Evernote, Proton Calendar, etc, etc..
If you want to really DIY it, and depending on the things you want to be notified of, the Pushbullet API is pretty decent. I have been using that for years. You could probably do something with IFTTT or Zapier or something similar too.. I haven't dug into those.
Unfortunetly all of them are propietary.
https://vikunja.io/ is open source nice one. They have Android app in beta.
I haven't verified that everything is totally there, but Proton has all their stuff here: https://github.com/ProtonMail
It would take an hour or two to write something like that as a lua plugin in awesome wm. I wrote a 'egg timer' type plugin and notes plugin in maybe an hour each when I was learning it. This sounds like something similar.