I am going to HK (from US) on Feb 20th at the end of Spring Festival. I am wondering about the likelihood of finding a flight from HKG to Guangzhou, then on to another destination, on the 21st. I can either wait until I get to HK to get a ticket, or get a non-refundable and non-changeable ticket from here for the flight HK to GZ. My inclination is just to wait until I get to HK because my flight into HK could be delayed, then I'd be stuck with a useless ticket. So I'm wondering if there will likely be many people flying HK to GZ on Feb 21, or am I very likely to find getting a ticket easy and the crowds light?