Why not try to add a second set of dates
So I know alot of people who didn't get tickets, had already gotten rooms, and taken time off of work in the hope they'd get a ticket, and adding more dates for a second festival in the US doesn't solve those problems, but why not do it, clearly there's a demand, if you do it in vegas if the RIO still has the room available you might even be able to just extend the event a few days for a second festival and not have more setup charges, yes it would involve more rental fees likely for the equipment, but you can hold mostly the same panels, and give relatively the same info and the attendees would probably be thrilled just for a chance to be there sharing in the camaraderie and having a chance to see their friends. If the Rio doesn't have the space, maybe look elsewhere and see if you can't find someplace to hold another event.
You could also see if there's anyplace else available and hold a Fanfest Overflow Event where you still set up games and things, and just let all the panels and announcements be streamed into it with a projector. Would mean you'd need to make more prizes and things for the overflow event, but that shouldn't be too bad, in 2014 you ran out of prizes, sadly I didn't make it to 2016 so I don't know if there were similar problems there.
Also will the change back to the Rio mean that volunteers will be needed again, because that's how I got a ticket back in 2014, and I had a blast just helping out at Odin and the Frontline Games, still got to see the panels and interact with people.