While several announcements have been made in the past (like the Buffalo Bills requiring such passports), with the current CDC guidance there's no guarantee that's going to still hold going forward. With many stadiums already opening up for full capacity and many of them maskless now, I think it's a valid question if the venues are going to want to go to the added expense, especially for games and concerts that will be occurring months from now. (assuming, of course, things remain on the current trajectory).