There are some dates I remember because of the deaths that occur. May 19th will always be the day of Anne Boleyn's execution to me, despite family birthdays.
Today is the date that Martin Luther King Junior was assassinated. I don't remember where I was at the time; I do remember that no one in my immediate circle really cared.
Here's U2 on youtube. Here are details on the assassination. How would our history be different if Dr. King had lived?