I’m pretty sure no one missed the rapid increase in remote working during the first half of 2020. Something that also became very clear in the Microsoft Teams UserVoice were entries that were pretty ...
Updated Jul 07, 2020
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I actually think it worked really well with trusting on peoples punctuality, have some extra time prepared if you need it (but I haven't needed it so far).
If you use this strategy you can post the same messages in several channels at the same time. Start writing a message in the main room, click the little A with a pen icon and you'll get more options. Choosing Post in multiple channels!
I think it should be enough, otherwise you could jump between the rooms and tell people to get back :).
You can invite external people to a team and make this possible, so creating the team on your side and invite the external ones shouldn't be an issue.
Good luck 