This will pass and I think we've probably been exposed to this virus even as early as last fall and didn't even know it. Eventually herd immunity will slow the spread and I think a good dose of fresh outdoor air even in a packed stadium will do us more good than fearing the virus as we are right now.
I understand why you might think that. Last Thanksgiving I had a fever for 5 days and had absolutely no motivation to do anything. I could extrapolate that it was the virus, however, I believe it wasn't until December that there was ANY news from China about this. Also, if I had it why aren't we seeing exponential growth starting in November instead of Feb/Mar
Easy to imagine I had it, but taking all evidence together, not very likely.
Also, sitting in a packed stadium with ANY infected people is NOT a good idea. If you think so, go visit a COVID patient and get in bed with them for a few hours. Get some fresh air, for sure, but don't do it with anyone in coughing distance from you.