Theoretically, an impossibly complext computer might calculate everything that is going to happen. That is, if the universe is only as complex as much as we know certainly now. I mean, there is no telling how more complex the 11-sting theory would make the universe if it was true. Or no telling how maybe objectively random things like dark-matter are.

However, being able to theoretically know everything that is going to happen, has nothing to do with 'fate' as most people use it. It isn't written in the stars, or in cards, or in anything for that matter.

It even really doesn't matter weather we Can or can Not theoretically know what is going to happen, because I don't think we ever can. And if we could predict stuff, know the future, the 'fate' of the universe, we would act upon it, causing some sort of a paradox I guess.