Perhaps the whole thing isn't meant to have an explanantion? I doubt there is a conspiracy, or plan, involved in the "dispensing" of dreams and visions and foresight amongst various characters. What if, rather, the great tide of events took on a life of their own? Like the rumblings in the Earth that precede an Earthquake, for example? People all across the North-West of Middle-Earth just heard a piece of the tremors, before it hit. Or perhaps, according to the song, or theme, and the design of Eru, that these things were meant to happen (part of a Doom), and thus fulfil Eru's plan. It seems to me, throughout all the pieces written by Tolkien that the things that are meant to happen, invariably do. Frodo's Quest was meant to happen, and thus it did, because of the coming together of many, often fractious, forces at work in Middle-Earth.
-Felagund
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