A recent copy of the flying program for the opening of Airshow China 2016 seems to suggest that the J-20 is no longer flying on the first day of the show. We can confirm that this is not true.
Instead, the slot allocated for the J-20 is hidden in plain sight. It will fly right after August 1st finishes it display.
Listed on the flying program is the Y-9. However, the Y-9 has already arrived at the show site and is parked in the static display. There is also no other Y-9 that will be attending the show.
Therefore, the Y-9 display slot is actually meant for the J-20.