@franny_r

Hi, I don't know much about that but Google shows there are quite a number of Cantonese classes in Shenzhen or Guangzhou, though not likely for English speakers.

http://www.google.com.hk/search?hl=zh-CN&newwindow=1&safe=strict&biw=1280&bih=677&q=%E6%B7%B1%E5%9C%B3+%E5%B9%BF%E5%B7%9E+%E7%B2%A4%E8%AF%AD%E8%AF%BE%E7%A8%8B&aq=f&aqi=&aql=&oq=

There should be plenty of them in HK. Many HK universities like HKU, CUHK and HKBU have classes at different levels that you could check out for details on their websites.