Office 365 - Microsoft Teams - Make It a Channel Meeting
How to make a channel meeting when scheduling a Teams meeting.
*Note: Information is provided by Microsoft Support's article called "Schedule a meeting in Teams."
Make it a Channel Meeting:
*Teams for Desktop/Computer
1. Select New meeting.
2. Type the name of a channel where it says Add channel (under the time and date fields).

Channels can't be edited or added once the invite is sent. You'll need to send a new invite with the updated channel.
*Note: When you have a meeting in a channel, everyone in the team will be able to see it and join it in that channel.
Once you've added the people you want, select Scheduling Assistant to find the best time.
If it's a recurring meeting, open the dropdown menu next to Does not repeat (just below the date). Choose how often you want it to occur from the default options, or select Custom to create your own cadence.