I just laughed when I walked up and they said the queue was closed. We had waited all day for Monster's to open and we just happened to be exiting Werewolf when they opened it. We jumped in line. It looked like we were actually gonna get to ride it. We made it most of the way through the queue and the emergency flashing lights with alarm came on. Not the usual "the ride is down" but full blown Fire Alarm. They evaced the entire building, gift shop and all.
That is when we went to Potter and the queue was closed.
I would imagine the same thing happened there.
Fire alarm evac procedures are part of the training process, so...Welcome to your free visit to stress test the park.
They actually have to have OCFR on site for the Fire Drill stuff so it makes sense they would do multiple drills in one day.