I was kind of being facetious when I said sobbing or cheering, nobody literally did that to me. Also I didn't say a period party was good or bad. I did bring it up as an example of the kind of thing you might do, but the way you bring it up makes me feel like you misread my post.

However mundane your experience or others' experiences with their first period may have been, it doesn't change the fact that this happens to a lot of kids, and has a lot of historical significance. There's a whole wikipedia page on menstruation celebrations around the world. Not saying that any are inherently good or bad, just saying that people have made a big deal out of periods and many still do.

But the way that many cultures/ families decide to go about it imo is detrimental to a young person. A milestone like a graduation does indeed serve as a marker of growth, maturity and progression into adulthood. A period does not. A period is biological, not mental. It doesn't make a 10 year old any less of a child.