I've been encouraging my multiple(!!) friends who directly witnessed some pretty shocking ADA violations to file witness reports with the DoJ, and the Nevada AG. If you're reading this and you directly saw or experienced something, please do the same.
Instances of shoddy organisation and poor protection for attendees were most acute with ADA attendees, but not unique. EVERY SINGLE ATTENDEE I KNOW has a horror story, ranging from being catcalled repeatedly in the 100 meters between the road and the con hall, having their sentimental water bottle thrown into the trash by security, the entire debacle at the concert with the Elpis flowers, and with the hotel bar staff not getting the memo it was a CONCERT and loudly shouting and throwing items into sinks during the performance...
I honestly think attendees are owed some sort of apology, and I wasn't even one of them. Tickets were more expensive than last time, came with less than last time (no minion or ingame outfit), and the event overall had the organisation and professionality you'd expect from a first year anime con run by a 2-person LLC in a medium sized city. Not an international, multi-billion-dollar corporation promoting their flagship.
And again, that's even outside the ACTUAL law-breaking that took place by staff blatantly and callously failing to comply with the ADA.
Attendees:
If you witnessed a violation of the Americans with Disabilities Act by any staff, report it to the Department of Justice Civil Rights Department, and to the Attourney General's Office of Nevada. Even if you're "just" a witness, the victim may be too shaken or embarrassed to come forward; or, might have come forward and not been believed. Your honest testimony is important.
And if your weekend was at all spoiled by something that more staffing, better organisation, better training, or hiring a different venue could have prevented, let Square Enix know. They ought to have done better.