It’s just a shot of people standing around, and yet the actors on screen are as clueless as to what the reality is as when they’re fighting Thanos by looking at a tennis ball on a stick.
One assumes that several other people in the same scene are standing there thinking they’re at a wedding.
It’s one thing to not really know what you’re doing when you’re part of a major green screen CGI battle, but there are no digital effects at this moment.