Other than the
HKGA there are some go schools mainly for children.
http://www.childgo.com/index2.htmlhttp://www.monchukid.com/go.htmhttp://www.hkgodev.com/http://www.smartgo.hk/http://www.weiqi.com.hk/go/home/home.php3There is also a bunch of HK go enthusiasts hanging around on KGS at the social room 香港討論區.
But they seem to mainly use Chinese/Cantonese.
Not sure about an English go community in HK though.
Best bet is probably to visit the HKGA and ask them.
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Go is such a beautiful game.