The flight today at Chengdu has been cancelled, according to the Chinese forums. VIPs were noted getting a guided tour of the aircraft. The airspace was cleared and the nearby international airport was closed down for the period.
According to the Chinese forums many spectators were moved on from the best viewing spots. People were even up the trees!
Looking at the images it is clear that the weather got in the way!
New video of J-20 being towed. Taken from eastern side of Chengdu.
TJ