Went to the InterGem Gem & Jewelry show this weekend- first I’d attended sine late 2019/early 2020.  I only went to day 1 of 3 (Friday) because of relatives coming to town, a veterinary emergency, and an abundance of caution.
While I was masked up the whole show, most of the vendors and attendees were not.  Event staff and security were masked.  
Even if it were not for the family & pet factors, I’m not sure I would have attended another day.  Saturday & Sunday would have had much bigger crowds, and if the masking percentages had remained the same, I would expect bad things to happen.  (See also, the Delta variant.)
I post this to provide context for the upcoming Cons I’ve seen others mentioned.  Hopefully, our hobby can do better.