I remember the first one in 1970. Our school decided to honor it by cleaning up the local road shoulders of trash.
We were dropped off in groups of 3 with trash bags for the day.
Our group was given a mile of road near a gas station/convenience store. The drinking age had just been lowered to 18.....so we proceeded to the store and bought a twelve pack of beer and sat in the sun to think about it.
When the bus returned to pick us up...we turned in our bags that had plenty of cans.
We did our part.