This is the measurement problem in quantum mechanics. Attempting to write about a historical event disturbs it. Even so, the metaphysics of history is extremely philosophically interesting. I don't think it matters so much on what day a given event happened or even who was responsible for it. But the economic, cultural, and scientific conditions surrounding the event are critical to understand and relate to our current world.
This may be interesting to philosophers, but this discussion is already 40 years old in the philosophy of history. We keep running in circles when new books keep setting themselves off against 80 year old analytical philosophies of history.
shared history makes up a huge part of the social consciousness, so yes, definitely philosophicly interesting.