If you would like to send a teams calendar event to all the members of a team then you should create a teams calendar event via the Calendar App as this app will allow you to select a Team as an attendee. Which in turn will send the invite to all team members of that team. This will save you having to enter every recipient into the calendar event.
Go to www.office.com and sign in with your CEWA credentials
Click on “All Apps”
Select the Calendar App
Click on “New Event”
Click in the “Invite Attendees” text box and start typing the name of the Team.
When you have completed your calendar event click the “Send” button. The event will be sent to all the group members of that team.
Your calendar event should now appear in your teams Calendar