If you think teaching happens right up to the last minute of the last day of school, it’s apparent you’ve never actually spent time at your child’s school on the last day of school!
Maybe private schools, but it doesn’t happen in public schools, at least not in the several school systems I’ve taught in over the years. :-)
Both of my boys' teachers had their classes working until the last half hour of the last day. Those last 30 minutes were spent cleaning out totes and cubbies. Not only was that how they spent the last day of school, it was the actual last day of school. The district mothballed it.
My 4th grader's class had achievement awards. The whole class had a picnic lunch and the teacher handed out awards then--no classtime lost, and the awards were strictly academic.
I've got a ton of housework, folks! See ya