Wondered about the capacities of the stadiums, so thought I'd share here for anyone else wondering.

Chelsea v LAFC
Mercedes-Benz Stadium, Atlanta
Capacity 71000
Attendance 22137 (31.2% full)

Botafogo vs Seattle
Lumen Field, Seattle
Capacity 68740
Attendance 30151 (43.9%)

Palmeiras v Porto
MetLife Stadium, NJ
Capacity 82500
Attendance 46275 (56.1%)

EDIT to add today's game

Flamengo v Espérance
Lincoln Financial Field, Philadelphia
Capacity 67594
Attendance 25797 (38.2%)

These are just the worst ones of course, some matches have done ok.