Never has a vaccine been mandated (except for children who want to attend public schools, to protect other children) and never will a COVID vaccine be mandated.However, it is not a constitutional right to attend a sporting event without complying with the organizers’ safety requirements...which may include vaccination for entry.
We haven't had a Pandemic like this since the Spnish Flu in 1918, or there about. Not to be political about this but if Biden gets in the WH, I could see the democrats mandating this though..
As far as sporting events showing proof of vaccination before entering, that would be the kiss of death to that organization. If 50% of people oppose vaccination , that's 50% less spectators .
If the Goverment doesnt sign into law that you cant sue people because you think you got the virus from one particular place, then this country is more screwed up then ever before.