@KitTkat
I think I understand what you're asking. Someone else mentioned that, when a certain show is on, you might see threads started with titles like, "who's watching the Linea show right now," and everyone watching the Linea show can chat in real time, so to speak.
If I were inclined to do something like you suggest, I might post a thread with a title like, "Let's talk about [fill in the blank with your topic]. Then my first post would say something like, "Let's talk about [subject] Monday night 2/5/18 at 8PM EST." Then, hopefully, those interested in talking about your subject will come by tomorrow at 8PM to chat "live."
I don't think you need permission to do something like that.
~~~ I call dibs on the popcorn concession!! ~~~