What happens on School Improvement and Teacher Institute days?

We've all seen "School Improvement" and "Teacher Institute Day" on the school calendars for years in district's across Illinois. But do you know the extensive work involved for teachers on these days, and how that time impacts student learning?

Watch this video to learn more about the learning that takes places on days when the kids are at home: https://youtu.be/gj-zTrYW8Uk