This is a practical (and obviously for football fans, applicable) experiment with 2000 people in Leipsig, Germany   https://wgntv.com/news/coronavirus/thousands-crowd-into-indoor-concert-in-german-experiment-on-how-to-return-to-normal/   Researchers in the German city of Leipzig staged a 2,000-person experimental indoor concert on Saturday to better understand how Covid-19 spreads at big, busy events, and how to prevent it.   At the gig, which featured a live performance from
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