Thank you! Fantastic work!
I'm bored too, so I decided to spend the last few days trying to gather the results for every edition of the Junior Pan American Artistic and Rhythmic Gymnastics Championships. I was able to find most of the results, what's very surprising even to me, considering these events date all way back to 1987! The only event I could find nothing about, except for confirmation that it did indeed happen, is the 1987 Jr Rhythmics Pan Ams. But given how old this is, I think it's perfectly understandable that not even Web Archive or obscure newspaper archives have nothing about it.
As usual, I've uploaded all of the results to Wikipedia. The full list is here.
EDIT: Guess what? I found some results. They were hidden in an electronic library from Mexico. Now I've found results (not all of them, but most of them) for all 36 tournaments. Nice.