This digital monthly calendar or planner for google sheets is for the current school year. It includes free yearly updates. There is a sheet for each month that includes a notes section along with showing the previous month and the upcoming month on the side. The previous and upcoming months are linked to the sheet containing those months so you can easily switch between months. Most major holidays are already on the calendar but it is fully editable so you can take them out or add more.

This can also be used for team planning purposes. If you have multiple teachers teaching the same class you could use this as a calendar for the class or for daily prep. I typically add in events or duties that I have for the week at the top of the day.