All in all being around people in an open air stadium is unlikely to result in you catching it. The biggest risk is if you touch a surface that has the infection on it and then catching it from there.
If you are not comfortable though then don’t go. The rumours are that it’s going to be announced as being behind closed doors in anyway.
Luckily the stadium is notoriously free if surfaces that the 52,000 won't be touching.