I won't say it's the most important thing to ever happen on that day, but it's not totally insignificant, either.
Read a book.
Events do get known outside of their own country, depended on various things. Magnitude and deathtoll being one, but many other reason why certain events get more coverage than other.
It is difficult to asses which events are ones that are known globally. Especially with things that are very known nationaly. In a certain situation it is hard to imagine how things otherwise would be, like would I have liked/done this or that If I never had met that person. No way to know you cant turn back time.
Good quiz like these each month but they are usually pretty easy - coz most guessable