Thanks for starting this thread, XBEHERE. It will be interesting to see the numbers come in from various places (both in and outside the USA) as the convention season goes on.
This would be a good thread to keep all those anecdotes about attendance together, so we can see how much it's fallen across the board (as I suspect it will).
Here in the UK, the English RCs run from June 23-August 27 with the first in Sheffield and the last in Liverpool and London.
Interesting, the argument from that CO about people "breaking up" their attendance over several weekends. I thought the org always 'encouraged' publishers to only go to their assigned convention? Even allowing for those who are working to attend a 'listening' convention, that wouldn't account for many, maybe a few hundred - besides which, that should show up as a slight increase elsewhere. I've never heard of that excuse, certainly not on mass. That definitely sounds like reaching.
Time will tell whether any locations do increase slightly, as the numbers come in. But I doubt it.