Forgive the pun, but this is post 1066 here, so it might as well be now.
History throws up a few really significant dates, the kind you’re expected to remember through history lessons. 1066 AD is the classic example in the UK, the year of the Norman Conquest. Don’t ask for a specific day for the Battle of Hastings, though, it’s not like the 4th of July in the USA. See also the 5th of November. We remember, remember, but would probably have to look up which year the Gunpowder Plot happened in.
Which dates, day and year, do you remember from your history lessons? If you stepped out of the TARDIS and saw a newspaper for a specific day, what would it take to get a reaction?