Do you believe there are or have been occurrances in this world that are/were inevitable?

Amongst my studies of philosophy determinism, be it theological or otherwise, has always been particularly fascinating to me. It being true would imply that the concept of ‘random happenings’ is but an illusion which I, of mere human mind and body, personally find difficult to comprehend. The world that surrounds us can seem so uncontrollable; lacking pattern or sophistication, yet when analysed this complex chaos is often converted into simplistic scripture and algorithm with relative ease. Was ‘WWII’ unavoidable? What if Adolf Hitler were accepted into art school and consequently chose to lead his life differently? Was this also plausible? Were there googolplexes of events and actions which, when combined and bonded, could only reach one conclusion? That Adolf would be the driving force behind an event of such magnitude.
Ladies, gentlemen, and otherwise, I request your thoughts on this curious thesis. Are there or have there been occurrances in this world that are/were inevitable?