Last report I saw from the CDC after an outdoor event was on Sturgis, (the numbers quintupled)
https://www.nbcnews.com/news/us-news/south-dakota-covid-cases-quintuple-after-sturgis-motorcycle-rally-n1277567
But I've never seen one from the various games, college or pro. It's only week 3, so we might start to see them shortly