A little bit of a bonkers idea considering logistics and timeline, buuuutttt....
What would be the interest level of a Minecraft server that recreates the convention center & hotels?
I know there are a lot of mods out there that could let people have "vendor booths" and restrict/allow building, plus ways to hyperlink to websites. It could also be cool to have open build areas for attendees.
It's a huge endeavor and would require a lot of volunteers both before and during the con, but I would be more than happy to help organize if there's enough interest.