[MaxWilson]

In general, events are tied to scales. High Productivity unlocks certain province-improving events, for example, while high death unlocks deadly plagues. When Turmoil is high, you can get the 1/5 of population wandering off event, etc.

Luck is tied both to certain spell effects (Crossbreeding) and to your chance of getting national heroes. With Misfortune-3 you will never get any heroes at all. I suspect it's something like 3% chance per turn of getting a hero, +/- 1% per Luck scale.

-Max