Totally unrelated, but I still remember what I did on 9/11. I was in my teens. I know the date, I know the weekday, I know everything I did in the 24 hours it happened. However, despite being the much "fresher" events, I don't know the weekday my grandparents and parents passed away, let alone what I did back then. My memory is... interesting.
For me, it's the Challenger disaster, 9/11, Columbia.