Thanks Pat.
The more I think about it, the more I think that the 4th reason is the only one that matters, maybe the first and fourth together.
I think that we are talking about events that happened before Memorial Day, and as you said, many are set years in advance. I would think that if the club wants to allow wide leeway in practice rounds, they could.
The argument has been that the visitor can not displace the members, and can not have run of the show sort of speak. But at Garden CIty, they can, and the reason they can, is that members are proud of the tournament and are willing to put up with some visitor play for that week. If the members at all the hosting tournaments felt the same way about their event, I suspect it would be easier to shcedule practice rounds.