Overview
This article describes how to add the channel calendar app to your Microsoft Teams. A channel calendar is a shared calendar available to channel members.
Details
Adding a channel calendar
To add a shared calendar to the channel:
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Select Add a tab 
at the top of the channel
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Select Channel calendar from the list of apps available, or search for it from the search bar at the top.
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Give the calendar a name and select Add. By default, Teams will post to the channel about this tab unless specified otherwise.
Scheduling, modifying, and canceling a meeting
Scheduling
To schedule a meeting, left-click the time slot on the calendar in which you'd like to create it. The meeting details window will appear where you can enter the meeting title, attendees, duration, and other details. When you're finished entering the meeting details, select Send to schedule the meeting.
For more meeting options for participants, select Options on the right hand side and then More Options.
When you're finished, select Save to keep the changes. For a description of what each setting does, please see participant settings in Microsoft Teams meetings.
Modifying or Cancelling
To modify or cancel a meeting, right-click the meeting and select Edit or Cancel.
Rename or remove the channel calendar
To rename or remove the channel calendar, right-click the channel calendar tab and select the rename or remove option.
Limitations
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Channel events can only be scheduled and viewed from the Teams app.
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Channel calendars are not available in private channels.
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Only one calendar is available per a channel.
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Guests can't view the calendar and must be invited directly.