The OP can not be banned from public areas.
That one would hit a higher court so fast you'd get dizzy from the crosswind.
The league did not give him a written contract, because the could not. It is a public style event.
>>>> I agree that stepping into an others hard sought work arena is a cheesy thing to do <<<<<<
They can make a bad name for him, carefully ( slander is something to sue over ) they can not sue him.
Can the tax boys play with him, maybe, maybe not, hobby business rules are strange.
I know it tweaks many off but, push come to shove, there is little if anything legal they can do to the photog.
Now if it was privet land ( or lease for that time and place ), that's another story, then the league has to cover insurance, lights, crowd control. They become liable for a host of things, they are not set up for.
I get so ticked sometimes, I wanna wrap them in the jaw for stepping into something I worked for, ( don't it a fine and maybe 3 days in jail, depending on how hard you wrap them )
Emotions run hard at times and try to trump facts but, Public is Public, the same fight photographers struggle with since 9/11, over where we can and can not shoot on public land.