Difference between Happen and Befall

HAPPEN vs BEFALL: NOUN

To encounter something by chance.
To come or go casually; make an appearance.
Used with the impersonal subject it and a following clause or infinitive to indicate the occurrence of a usually unexpected or chance event.
To have the fortune (to be or do something); be in a situation or position (to be or do something).
Used with an infinitive to make polite requests.
To be the fate; become.
To come by chance; to come without previous expectation; to fall out.
To take place; to occur.
To meet with; to fall or light upon.
To make a casual call.
To come to pass.
To come about as a consequence; result.

To come to pass; to happen.
To come to pass; happen.
Used with the impersonal subject it and a following clause to indicate the occurrence of a usually unexpected or chance event:
To happen to: : happen.

Possibly; perhaps.
To occur by chance; occur unexpectedly or unaccountably; in general, to occur; take place.
To chance; be by chance or unexpectedly: as, he happened to be at home.
Fortunate; happy; blessed.
(Santayana)
Come into being
Become reality
Come upon, as if by accident
Meet with

Come about, Pass off, Bechance, Go on, Take place, Hap, Encounter, Chance, Pass, Bump, Hit, Find, Befall, Materialize, Occur

Spared, Wreak, Ensue, Devastate, Perish, Occur, Foretell, Inflict, Afflict, Suffer, Hit, Affect, Bechance, Betide, Happen

Recur, Unfold, Come, Come about, Go on, Take place, Hap, Encounter, Chance, Pass, Bump, Hit, Find, Materialize, Occur

Averted, Arise, Portend, Endure, Spared, Wreak, Ensue, Devastate, Perish, Occur, Afflict, Suffer, Hit, Affect, Happen

It basically describes all the horrible things that happen in hell and all the awesome things that happen in heaven.
Make sure it is clear what will happen when the rules are followed and what will happen when they are not.
And if it can happen to Jennifer Love Hewitt, it can happen to you.
Richard Stamp of London had one of the worst things that can happen to a man happen to him, he lost his fucking penis.
Although this used to happen regularly under the Supporting People programme, it does not happen regularly now.
And that again will not happen immediately, but could happen over the next year or so if his conviction is upheld.
That way at least you know what will happen should something similar happen in the future.
Meaning: If you want something to happen, make it happen.
Some want it to happen, some wish it would happen, other make it happen.
Yet assumptions have a major impact on what individuals expect will happen, can happen, or should happen.

Now, what harm will befall you in taking this side?
Gulliver narrates the adventures that befall him on these travels.
That such heavy affliction should befall so virtuous a Character!
It is increasingly possible the same fate could befall Trump.
Your own capes befall in detail baked plus relatable.
This is the greatest curse that can befall them.
There are several calamities that can befall the novice.
Tharthar will allow no harm to befall Alia.
OF NTRODUCTIONDisasters befall developing and developed countries alike.
Plaintiffs givethis debate justiciability by assertingharms that befall or will befall them personallyand to a greater extent than oldersegments of society.