Short story, as far as I remember. One Argentinian (a Doctor I think) was watching the moonlanding, July 20th 1969. He was overwhelmed by the idea that the whole world was watching it at the same time, all together, as if humankind was all one thing. After that day he kept thinking and he decided it was like if all humanity were friends with each other, for a moment. And then he realized that even when we already had "Days" like Mother's, Father's, Children's we had nothing to honor friendship. And that is very important for Argentinians. So he began a campaign, it was successfull and he also wrote to other countries. And so, International's Friend Day was born.
Now, according to my computer's almanac, there is an International Friendship day on July 30, so that is a mistake or someone robbed the original creator's idea. But the day was July 20 because it was the moonlanding. It was special for that too because all the other "Days" were always on Sundays, like "3rd Sunday of October).
It was a big thing for Argentinians. We gather to have dinner, or make a picnic or something, gave small presents to each other, all that jazz. The thing became less popular in the last decade and particularly it has declined a lot since the pandemics, but apparently this year was a little better, so who knows? Perhaps it will rise again. I hope so. I really like it.
In other topics, I do not know if it is true, but I just read in Reddit that Jim Butcher married.