Teams Meeting Suggestion

Ken_GFirst of all welcome to Tech Community we are empowered with users like you, about the question you asked here is my answer to it;

 - When you invite a channel everyone part of the teams will see the on-going meeting or even get notified base on their channel's notification settings alternative could be creating group chats and schedule meetings for specific tops or groups.

UserVoice for this option - https://microsoftteams.uservoice.com/forums/555103-public/suggestions/33656554-do-not-invite-the-whole-team-to-a-channel-meeting

- Private channels currently do not support scheduling meetings but do have meet now option. here is the UserVoice for this function - https://microsoftteams.uservoice.com/forums/599053-schools-and-universities/suggestions/39112060-ability-to-schedule-meetings-in-private-channels

Here is what you can do more on Private channels and as it is new more functions will be included soon.

https://docs.microsoft.com/en-us/MicrosoftTeams/private-channels