They Kept You Inside!
What a waste of an educational experience! But, yeah, the onset of darkness itself is cool.
Before totality you need some sort of filter, becasue its like, well, looking at the sun. Once you are in totality you don't use a filter, becasue the photosphere is covered. The corona is about the brightness of the moon, and its more diffuse. Safe to look at, and not bright enough to shine through a filter that is safe for the rest of the time.
We had filters I made from aluminiumized mylar. If you look at my wife's pictures you can see her holding one. From one A4 sheet I made a filter that fit over my camera and two that we could hold by hand. It turned out several local businesses were handing out viewing glasses at the airport, but they weren't very good.
I think I remember that '78 eclipse (would be the right grade in school for me). It wasn't total where I was but it was enough to make the light look a unusual color. I was out on the playground at lunch projecting crescent images of the sun with a pinhole. I don't think anyone else at the school knew about it, but then, thats how things went at my school.