The thing I wonder is if New York achieved a form of herd immunity this spring after the mass infections. That perhaps the virus was more widespread - especially when you account for the fact that subways were not closed until May. So even with mass gatherings (in the form of political marches), because of that immunity there was little effect. Because you’re right - there has been no uptick in NY.
Meanwhile other states locked down AND did not have NY’s subway transit system, and thus did not have the virus spreading like in NY this spring. And now through a combination of reopening (TX, FL) and political marches (CA), these states are getting widespread exposure for the first time.