https://support.google.com/edu/classroom/thread/337957180?hl=en&sjid=12445409142137887004-NC

https://support.google.com/calendar/thread/337957079?hl=en&sjid=13566236968514811898-NA

https://support.google.com/edu/classroom/thread/337956461?hl=en&sjid=4266165195400771554-NC

https://support.google.com/calendar/thread/337956300?hl=en&sjid=13566236968514811898-NA

https://support.google.com/edu/classroom/thread/337955975?hl=en&sjid=4266165195400771554-NC