If the courts consider the Phillies to be a state actor (which is quite possible given the funding/operational support they receive from the sate), then you cannot give up your free speech rights by buying a ticket. It can say it on the paper, but it is not legally enforceable.

Thank you Mr. Lawyer, but again I refer you to the specific article where they said specifically it was unsettled law, because:

As far as a 2 second search tells me, the stadium is a public entity owned by the City of Philadelphia. I dont think “freely open to the public” is in the first amendment. So yes, free speech rights could definitely apply, if the guy actually wanted to sue. It is unsettled law.

If the stadium were a public venue (such as a university stadium), it would be questionable.Even publically funded stadiums may be subject to first amendment protections, it has just never really been tested:

She is “just dealing with it.” This is her way of “just dealing with it,” by dressing in cosplay. If it is affecting her performance or the performance of the company, then management should fire her. The fact that they havent seems to indicate that they don’t want to, because she is good at her job and her dress is…