I don’t know what is going on but you might want to ck this out.
http://www.foxnews.com/on-air/hannity/index.html
I would think if it was going to be postponed, it would say do.
See 687
Programming change: Due to @realDonaldTrump's upcoming speech, the Trump town hall hosted by @seanhannity will not air tonight. #Hannity— Fox News (@FoxNews) August 17, 2016