I was able to sneak in on my last visit in March. The cast members were inside, not outside.
However, we apparently walked in when the cast member stepped away. We watched a bit from the princess shows they do. Then we wanted to go to the bar, but then we ran into the cast member at the door. He was back. I don't remember what exactly happened, but we left shortly after. I think we ran into the cast member when he was talking to other non-hotel guests with a reservation they wanted to change. The cast member asked if we wanted it, but there was something that made us decline. And then we left.
It is now possible for non-hotel guests to make a reservation at the royal banquet. I guess you could go to the bar afterwards, or maybe before.