Are all fan festivals like this?
Yes. They are. From your description? I have seen much, much worse. One I was stationed at as a medical officer, some lunatic had decided to slap a curtain over the fire exit signs in the amphitheatre ( yes yes I know Steve Jobs did it too )

Another Comic Con i was at, the main building had had a plumbing issue that hadnt been fixed, the closest working toilets were 400 metres away.

In another building.

These events are usually, as has been noted, outsourced. They are the ones hosting the event yes, but they DO NOT own or control the venue or its staff.

Your beef is with the venue organisers, not Square Enix.