I will be in the Jiuzhaigou = Huanglong area on April 27th & 28th.

I will be in the the two places are on April 27th & 28th, and will be relying on public transport. Because it will be close to May 1st, will it be crowded? Will it be difficult to buy bus, train and air tickets? I intend to go to Jiuzhaigou from Chengdu on the 26th. On the 29th, I intend to fly from JZG to Guangyuan and then take the train to Beijing.