Banning SOME of the people that were trying to attend the event. What is actually going on here? The articles and comment go on like everyone is getting banned

Banning SOME of the people that were trying to attend the event. What is actually going on here? The articles and comment go on like everyone is getting banned for any association to an event, and debating hypotheticals. Who is getting banned and for what actual reasons? Any hosts? Some guests? Who, what, and the nuances of why are notoriously missing from this