Creating a Group Calendar in Teams

You can create a group calendar in Teams by following the steps below.

Select the Teams Channel you want to create a calendar for

Go to General

From the top navigation bar, go to Files, then click on Open in SharePoint

It will take you to the SharePoint site.

Go to Home

Click on New > App

It will take you to a page where you will be able to choose from the apps, choose Calendar.

Choose a name for the Calendar app, then click Create.

It will take you to Site Contents, open Calendar. 

Once you open Calendar, copy the URL of the page.

Now, go back to Teams app.

Click on the '+' icon.

It will take you to a page where you can select a Tab.

Select Website.

Now, In the new tab add a Tab Name, then enter the URL you copied from the SharePoint site.

Check the box saying 'Post to the channel about this tab' if you want everyone to get a notification that a calendar tab is now available.

Click Save.

You will now see a new Calendar Tab in the top navigation bar.

This Calendar will be visible to all the members who are part of this Teams Channel.