City University of Hong Kong
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International Putonghua Club/Putonghua Salon aims to provide a platform for students to practice Putonghua/Mandarin after class. we offer individual counseling for non-native Chinese speakers of different levels.
It's free, and you don't need to register beforehand! 
Time: Every Friday 16:00-17:50 
Location:
B5-310 (Academic I) 

Facebook Page: Activity announcement, general information, activity photos and videos ect....(Link)

Facebook Group: Q&A, making new friends
http://www.facebook.com/groups/putonghuasalon/

Video and audio tutorials, useful resources on Learning Putonghua
http://pthsalon.LT.cityu.edu.hk/