This game-plan has been in effect for a while. My last conventions in mid 2000's ended having all assemblies, including the District Convention at the Newburgh Assembly Hall (Off I-84) in New York.
Congregations went to Yankee Stadium for decades, moved to Nassau Coliseum for a few years, only to have what was supposed to be just a Circuit Assembly meeting place (Which use to be in Monroe, NY), all falling into a relatively newly built (7 or so years ago) Assembly Hall in Newburgh, NY.
Again, last I was at one was mid 2000s, around 2007 that was the official arrangement for many congregations. No more Nassau, everything at Newburgh.