If you use Outlook in your organization, you can share a group calendar in Teams. For more info, see Create a group in Outlook.
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In Outlook for the web, go to Mail. On the left, choose a group to share.
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Select the Calendar button and copy the URL from the address bar.
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Go to a channel in Teams, select Add a tab.
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Select Website. Enter a Tab name and paste the copied URL.
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Check Post to the channel about this tab if you want, and select Save.
Tip: To add a teams channel calendar, see Add a shared channel calendar.