I am getting this strange sense of deja vu, much like last year, in the way this is heading...
Convention odds of happening live dropping fast :(
Look at it this way though to see the point I am trying to make. There are people who have no concept of basic hygiene that are in abundance at Gen Con. If these people can't put on deodorant I seriously doubt that they will get vaccinated. There has to be some sort of measure to reduce the risk to people and not allowing those who are not vaccinated is the easiest way to do this. Again I am not saying this because I am worried about myself. I am concerned for others as I am in very good heath.
I also think by not allowing those that aren't vaccinated will also eliminate those that will argue against wearing a mask because it violates their rights, those that think that COVID is fake news, and those that simply don't care if they infect other people.
Policing vaccine cards is probably impossible - even now, the internet is rife with articles about protecting that info b/c it's so easy to take and/or fake. If you think someone, like Comic Book Man (from the Simpsons), won't put on deodorant, that same someone will just get a fake Covid card. With every county in the US giving out different ones, it's literally child's play to do.It's hard to fake a mask (if that is necessary) - everyone in the whole Con sees it. It's hard to fake a facility and/or room cap - it's counted and needs only 1 person to count. It's hard to fake a badge if overall badges are limited - everyone sees those, too. Etc, etc...
When you put in place policies, you consider effectiveness vs efficiency (and then add in legality and expense). But no matter what policy, nothing will be perfect.
If Comic Book Man is too much of a risk for someone individually to attend, they probably should pass on 2021, since you literally can't police out the "exception" type of person. Something will fail at least once - ask Disney and their 1st day after the rain storm line at Seven Dwarfs Mine Train (and that was their own employees). So, there will be risk, however slight, but it will be the best that any reasonable person/company could do. Attendees have to accept that if they want to attend - no one and nothing can be perfect.
And then I'll start repeating myself, so I'll stop:)...
PS - That said, if Gencon wants to take on the task, well, my spouse is trying to figure out how to jump the line now so he's good either way:)...
I think its the central problem that Gen Con is facing. How do you have a safe convention knowing that there will be people who complain no matter what is put into place, as well as those that will find a way to fake through whatever is put into place. I'm sure the last thing they want is to put a mask mandate into place only to have to police people who refuse to wear them due to their inability to think of others.