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Re:Coronavirus: Germany puts on crowded concerts to study risks by fileeditview on Tuesday August 25, 2020 @07:58AM (#24270440)
From what I heard on the news this study is trying to figure out movement patterns in differently dense crowds. They have 3 levels of crowdedness.

The point is not to study or provoke infections. Everyone must wear medical grade masks (forgot the actual name).

There are still ethical considerations here but I don't think it is as severe as it may sound from your post.

Re:Coronavirus: Germany puts on crowded concerts to study risks by Certhas on Tuesday August 25, 2020 @08:53AM (#24270793)
Even the linked BBC article will tell you as much, including that every participant was tested for Covid 19. I have seen/used such temporal contact network datasets, they are very important to understand the micro-dynamics of disease spreading.