For more information on learning Japanese at Columbia, chat clubs to practice your Japanese, and study abroad programs, go to Columbia University's Japanese department's website.
For another great opportunity to practice Japanese with graduate students from Japan, go to Columbia University School of International and Public Affairs' Nihon Benkyo Kaia's (NBK) website.
If you are interested in learning taiko (Japanese drumming), check out the Taiko Society at Columbia University's Teachers College.
For information regarding lectures on Japanese politics, history, and the like, access Columbia University's Weatherhead East Asian Institute's website.
Another source of great lectures and Japanese culture events is Columbia University's Donald Keene Center.