Auditorium
Select the Auditorium check box to permits non-host members to send messages to, or see, only host members. Host members, however, can see and send messages to non-host members. When Auditorium is selected, only hosts are notified when non-host members join or leave the channel.

Consider an online conference held in an auditorium channel. A chat user joining the channel can see only those messages posted by the conference speakers. The speakers, however, can see and send messages to any conference participant (channel member). Only the speakers, as channel hosts, are notified when participants join or leave the channel.

Auditorium channels are often used for large chat events.