(Disney Plus via AP)NEW YORK Disney+'s streaming of Hamilton was surely the biggest event on television screens over the holiday weekend. Hamilton is the poster boy for how the science of measurement is not keeping up with how entertainment content is being consumed. For example, Fox News Channel drew 5.7 million viewers on Friday night when it showed President Donald Trump speaking at Mount Rushmore. CBS had 3.3 million, ABC had 2.3 million, Univision had 1.4 million, Fox had 1.3 million, ION Television had 1 million and Telemundo had 820,000. ABC's World News Tonight led the evening newscasts with an average of 8.9 million viewers.