https://support.google.com/calendar/thread/323804633?hl=en&sjid=1272949001641621714-NC

https://support.google.com/edu/classroom/thread/323803575?hl=en&sjid=1272949001641621714-NC

https://support.google.com/edu/classroom/thread/323804449?hl=en&sjid=14362543497121796001-NA

https://support.google.com/edu/classroom/thread/323803684?hl=en&sjid=14362543497121796001-NA

https://support.google.com/edu/classroom/thread/323802959?hl=en&sjid=14362543497121796001-NA

https://support.google.com/edu/classroom/thread/323802578?hl=en&sjid=3086432526746993849-NA

https://support.google.com/edu/classroom/thread/323801744?hl=en&sjid=14362543497121796001-NA

https://support.google.com/edu/classroom/thread/323800921?hl=en&sjid=14362543497121796001-NA

https://support.google.com/edu/classroom/thread/323800575?hl=en&sjid=3086432526746993849-NA

https://support.google.com/edu/classroom/thread/323800147?hl=en&sjid=17794352859179241962-NC