Yeah. Thing is, it is a commercial event. So, first amendment does not apply. Same as US posters here do not have first amendment rights here. It is up to the owners.
First amendment applies to the government. I would have thought the government understood that.
Do visitors to the US have first amendment rights. Hmmmm... yes. But not according to Trump. Remember him deporting foreign students for protesting. And this brings us to the 14th amendment. I think, and this is why I think the battle against birthright citizenship is interesting. This bit -
All persons born or naturalized in the United States, and subject to the jurisdiction thereof, are citizens of the United States and of the state wherein they reside.
Cos the way I read that, Trump could get around it by saying visitors are NOT subject to the jurisdiction thereof.
And that would make the US a real interesting place to visit.
Paging @AcrossthePond55 to tell me I am talking bollocks :-)