By accident I took a very cumbersome approach and found out I unconsciously settled with it, so I refrained from cleanlier solutions ever since: I take notes directly on the titles of events on google's calendar. It wasn't a conscious strategy, I used google keep before, but one day I needed to take a quick note and make sure I would not forget it so google's calendar was the way to go, and cumbersome as it was it just worked, and unconsciously I forgot of google keep existence ever since. So the virtue of this is that I always keep important notes on the loop until I settle them on a proper document (always Obsidian, it's just perfect). I only have to look on one app for everything, the calendar, so I make sure I don't forget anything, without thinking about it, specially if notes are linked to events. It turns out this is just a rediscovery of the good and ol' agenda, so I really hope google improves taking notes on the calendar in the future.