I've gone through 10 events in the bathroom already, but I just encountered states 1, 2, 3 and blank on the latest build.
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Go in to the restroom, check the number on top of the right door and then if it's not correct, go out to the docks and them come back in again. This way you can quickly check what event is behind the middle door. I tested it on my dev build and the pink dragon event works. It's in the middle door when the number is above the right door is 4.