Live Moderated Chat

[liunx]

I have a site at TCH that' has pretty popular forum. Recently we asked a book author if we could have a live chat with him and he said YES. But, now I need to be able to have this chat, make it public, as I'd like people who are not members of the site to join, and provide a way for moderators to act as insulators between the Speaker and the guests. Any ideas?<!--content-->