At the high school I used to work at, when I first began teaching there, I was amazed to learn that one period each day was considered an “optional” period for students. They could take another class if they wanted, but it was really free time when they could clear their minds, get academic help from teachers who were available that period, catch up with their friends, or study in the library. For many students, it was a nice break from an otherwise stressful day. And it was a really neat thing to see teachers (who were assigned to monitor the students) chatting with kids about what was going on in and out of school. What a novel way to build up a great community and establish rapport between students and teachers. (Our district eventually eliminated that period for understandable reasons, but it was still disappointing.)
That’s what I believe officials at Pine Creek High School near Colorado Springs had in mind with their “seminar” period.