Pope John Paul II visited the US on October 1, 1979, starting here in Boston. Post your recollections of the visit in the comments.
Update: for the "young adult" readers who don't remember the occasion (Hi, John!), here's a post from five years ago with my recollections.
You will kill me RC but I was only 7 and lived on the West Coast so I don't remember it so well... :S
I don't remember that visit much, but the 1987 visit (20 years last month) I have a lot of wonderful memories of. I was in the LA area at the time.