Unrelated, in high school we watched History of the World Part I in World History and our teacher had a piece of cardboard that said “censored” or something that he put in front of the screen during various scenes like “Bishop humps Queen” but allowed the audio to play through.
Snoopy was more ensuring than Charlie Brown, but even that was more "cute cartoon" than anything to do with any message.
Edit: I see some sibling comments that it's making a comeback, though I've no idea if any of it is all that faithful to the original.
Charlie Brown had a lot of Christian messaging reflecting Schultz's devout beliefs, and I doubt any of that will show up in whatever Apple and Target and current schools are putting together.
Yeah, my dad (a Baby Boomer) loved these and would make sure to watch them every year. I and my Millennial siblings didn't really care, it just felt old-fashioned. I had no idea it was still popular at all.
According to Wikipedia, as a franchise it's brings in more revenue than Star Trek or the Avengers.
Halloween, Thanksgiving, Christmas are the major ones. I think New Year and Easter were added at some point but not as well known.
Having said that, it makes sense that those shows wouldn't translate as well to a non-US audience.
And of course, there was the Oregon Trail video game in middle school. But, as far as I can tell, that was a pretty short-lived thing.