Here is an additional source stating that the environment was "hectic":
"Schreiber said she and her son, (omitted for TOS), 9, were interviewed Sunday by a federal agent. She said she told the agent that Friday was an especially hectic day at Skyline.
"On a normal day, seeing a stranger will make you go, 'Hmm. I wonder who that is?' On such a hectic day as Friday, there was such a lot going on. To tell you the truth, I was focused on looking at the (science) project and helping (omitted for TOS) fill out his (evaluation) form and not on the faces around me."
http://www.oregonlive.com/portland/index.ssf/2010/06/still_no_trace_of_kyron_horman.html
I'm thinking a normal day would have about 300 people, primarily students, and cars and buses coming and going in the parking lot dropping off students, some parents going into the school to tell their child's teacher something perhaps.
A normal morning at the school would be hectic, until most of the students are dropped off and settled in class.
On June 4, about 50 more people. Most people again primarily children, and most of the extra people primarily adults.
Deviation from the schedule and routine, excitement of the fair and having parents visit, freedom to roam rather than get to class, probably all did have the children excited and more hyper than usual. That would up the hectic factor.
People, including the extra adults, roaming the halls, versus students going with a purpose to class to their seats and begin studies, would up the hectic factor.
Congestion in the small parking lot with extra cars to park, versus average day drop-off-and-go, would certainly have upped the hectic factor out there.
My sense is not many more people than a normal day, and several factors contributing to a more hectic atmosphere than usual.
I'm not sure if it would rise to the level of what I would term chaos, but people use words in different ways, based on difference in understanding of their meaning and application. Also their tolerance for busy environments - some people perceive chaos in even small crowds, and become anxious.
On the other hand, with Skyline's lack of attention to policies and procedures, that may be an indication that the school lacked organization in other areas as well, and a normal morning may well have risen to, or near, a level of chaos. I just don't know. But if so, the morning of June 4 may well have been what even I would term chaos.
At a minimum, I see factors would have definitely increased the level of how hectic that morning was. It's a matter of how much, and I just don't know.