The sailing season has just begun here in HK. Usually this time of the year there is a race every other weekend at one of the clubs. It depends what you sail dinghy's or yachts as to where the action will be.
The china coast cup is scheduled for October 21 for a couple of days and then there is a race to Hainan Island on the weekend of the 27 October.
A race to Macau on the 2 October coming back a couple of days later I think is also planned.
Let me know if want more specific info.