Now we are planing a two-day workshop which will take place at Shinshu University, Matsumoto-shi, Nagano-ken in Japan around October 5th, 2013. The workshop will consist of mathematical talks, tutorial and demonstrations of Sage. One of purposes of this workshop is to increasing the number of Japanese users and/or developers of Sage.
Schedule and details is here (in Japanese).
This workshop is organized by KIMURA, Iwao (University of Toyama), NUMATA, Yasuhide (Shinshu university) and YOKOYAMA, Shun'ichi (Kyushu University). Please send your inquiry to nu at math.shinshu-u.ac.jp .
The web page of Sage days 39 in Kyushu, Japan on May 26--27, 2012.
See also the list of Sage days in official web pages.