The schedule seems a bit off. There should have been a concert 30 minutes ago, but nothing was there in the Shopping plaza. There were just some people doing dance emotes in the area where the concerts normally take place. This was on Ship 1. I didn't get in until around 6:35PM PDT, though, but they are supposed to be around 10 minutes, according to the schedule.
Yes, these shows are very short. If you were 5 minutes late you probably just barely missed it.