In writing the title of this post, I started thinking about how I would have identified "such a year" prior to 2020.   If the title "A Year We Won't Forget" ended in a blank, what year would we have filled in?

1963 (although I was an infant!) everyone associates that year with the JKF assassination.  Those that were alive during that time can easily recall where they were and what they were doing when those shots rang out in Dealey Plaza, Dallas, Texas.  A year we wont forget.
1969  Apollo 11 mission on July 20th was indeed "a small step for man, one giant leap for mankind.  A year we won't forget.
The 1970's  While I was still very young, I remember the 70's as my television shows being preempted due to news events around the war in Vietnam and Watergate.. A decade I wont forget
1981  I was in the high school library when i learned that President Reagan had been shot. A year we won't forget
1995  I will never forget the slow speed chase involving a white Ford Bronco.  A year we won't forget.

2001  The events on September 11, 2001 changed our lives forever.  It changed the world forever.  Terrorism became very real for everyone.  Air travel changed.  A year we wont forget

2020  We all learned about a virus called COVID-19.  Major cities shut down.  Over 350,000 Americans died of COVID-19 in 2020 alone and the number is still rising.  Masks became a way of life and we all improved our hand washing skills.  A year we won't forget

Of all the dates above, the first five entries are important dates and are dates we remember.  They made a true impact but the last two....... those are years we would really like to forget.