If you want to discuss the business of the meetings you can create Agenda Item channels. You can create it only under Meeting channels.
How to create an Agenda Item channel:
Сlick on Create new Agenda Item link under a Meeting channel
or сlick on New Agenda Item from Meeting context menu;
Fill in the fields in the Creating Agenda Item Channel window and click on Create;
Agenda Item channel is created!
You can create several Agenda Item channels under 1 Meeting channel.