I found this interesting old photo on flickr. It appears to be the gathering from one of the apparitions of Our Lady of Fatima, though it doesn't mention which month it is (it does mention the May apparition, but certainly the May one didn't have such a crowd!).
I think these apparitions have a special place in our family for a number of reasons.
a) My grandmother was Portuguese (spoke Portuguese, worked as as translator for a time and called Portugal "The Old Country" - when showing us old pictures, she always called her aunts "Tia", etc.) She visited Fatima numerous times.
b) I grew up near Our Lady of Peace Church in Santa Clara, California, which has held annual pilgrimages commemorating each of the apparitions of Our Lady of Fatima for many decades. We were "regulars" at these events for years.
c) My husband visited Fatima with a tour by Fr. Fox when he was in high school.
I'm not generally a huge fan of Wikipedia, but I thought their page on the Miracle of the Sun quite interesting on the whole.