Well the event is kind of intertwined with where the main story is going, however most people don't read quest text and all so they wouldn't know that.
Spoilers:
In one of the early side-quests in Wineport I believe, an NPC mentions that they've noticed the smaller moon appears to be growing larger (getting closer).
In each city when you finish up a certain Grand Company quest you'll see Cid and he mentions Meteor.
Also take into account that the Bombards originated from small meteors that landed here.
And now with the Curse of Dalamud, Moon mice are being controlled by the Lord of Rats and are stealing earrings made with pieces of the Bombards and resemble the twin moons.
So as you can see if you read the above section, there's actually a lot more to it than most people notice.
