Miami Marlins and Free Speech

Leave it to the Marlins to be the team that might actually test my theories on fan expression. Could there be a better example of a ballpark that is publicly funded even if not publicly owned and thus still bound by First Amendment limits?

I am attending tonight's game with a friend; I'll have to keep my eyes open.

Update: I did not see anything at the game--no t-shirts, no signs, no chants. Just an announced crowd of 14,000 (probably a few thousand smaller in reality), the roof actually open on an unusually cool evening, and the Marlins losing again.