Two relevant holidays:

28/9 Mid-Autumn festival holiday
1/10 China National Day

So HKers are taking a week off for the price of three.
Mainlanders used to (think they still do) take the whole week off for National Day.

I would just avoid HK and China altogether that week...too many tourists trying to get out.
But if you can't work around it CX interlines TG if you meet MCT http://www.flyertalk.com/forum/catha...ge-faqs-4.html