I remember it well. As an undergrad student at U of Cincinnati, I had one friend from Lima, OH who was a steadfast Nixon supporter. As far as my fellow students, he was the ONLY one.
On August 9, 1974 I was a freshman dental student, and in addition to the resignation of RMN, it was my aforementioned friend's 21st birthday. Every August 9, I remember my pal's birthday, (we are still in touch, he still lives in Cincinnati), contact him, and tell him to have a happy B-Day, and a happy anniversary of Nixon's Resignation Day.
Today, August 9, 2018, is also DW and my 10th wedding anniversary. I typically remember our anniversary after being reminded of Nixon's resignation,then making the connection to my friend's birthday, and thirdly, my anniversary. Which is OK because DW wouldn't remember it at all if I didn't remind her.
So,OP, thanks for the reminder!