Channels are open rooms in Community, one per role (Tour Managers, Production Managers, FOH and Monitors, Backline and Techs, Lighting and Video, Drivers, Merch, Artists and Band, Tour Accounting, Agents and Managers, Venues and Promoters, New to Touring) and one per city (Nashville, Austin, Los Angeles, New York, Atlanta, Chicago, Denver, Seattle and Portland, London, Toronto).
Find them: People > Channels on a phone, or Channels in the Community menu on a computer.
Anyone in Community can read a channel. Tap Join to post and reply; your joined channels sit at the top of the list. Tap Joined to leave. For you at the top suggests rooms from the role and city on your profile, with Join all. Your joined channels, with the newest post in each, also show on Community Home.
Posts show your name and role, like the Home feed. You can delete your own posts and replies. Posts from people you blocked are hidden from you. Use the ... menu on someone else's post or reply to report it or block them.
The list of channels is set by ATOM; ask the ATOM team if your role or city is missing.