There are two types of unavoidable events - those who are essentially inevitable, like death, hunger and thirst - and those who are unavoidable because of the choices, or the lack of choice, which are of our or of others’ doing or undoing.
Once you are born you are fated to death, but your death is not a product of fate, but of logic - since you are a mortal being, along with many other mortals, you are prone to the inevitability of death. The force we might interpret as a divine intervention, is but a result on the outcomes of logic and evidence.
The second type of unavoidable events, weren’t initially inevitable. My choice of monasticism has costed me an other-wise romantic teenage-hood. However, due to my own decision of celibacy during teenage-hood (and perhaps for all eternity), had lead me to experience a non-romantic teenage-hood. In other words, it was too late for me to experience romance, making the romantically-empty events of my teenage-hood, unavoidable.
This is an example for how one’s undoing can lead to one or more unavoidable events. When a chance is to be missed, whether intentionally or incompetently, some events are prone to be inevitable to be endured.
If you are, as a leader of a nation, negotiate discussions of peace with a hostile nation, and your negotiations were decently fruitful, you will make the events of peace unavoidable - thereby an example of how one can make one type of events inevitable, and a different type of events, evitable.
Much of our lives are under our control, but the different chronological spheres of different chances are not. While a woman can have control over her romantic relationships, she cannot alter the inevitability of becoming unfertile eventually. Likewise, it wasn’t a product of supernaturality, that made her fertility to be shorter in time, but a result of biology and of the logic that governs biological entities.