I haven’t posted anything here for a while (I guess I’ve lost the few readers who were following) and I won’t be writing in the 2 coming weeks; tomorrow I’ll be flying to Japan and then staying in Kobe, as usual. I’ll also spend 5 days in Tokyo from 28. I checked the concerts scheduled for the 2 weeks both in Osaka/Kobe and Tokyo.
On 23rd I’ll attend concerts of Merzbow, Nobukazu Takemura, Pita, etc, at Sunsui, Osaka (my day of arrival, jet lag + noise might be tough…). And since I’m in Tokyo on 30th, I’ll definitely attend the event organized by mantle musics at loop-line.

A few venues which usually have a good experimental music program (among many others):
SuperDeluxe, Tokyo [http://www.super-deluxe.com]
loop-line, Tokyo [http://www.loop-line.jp]
Sunsui, Osaka [http://www.sunsui.net]
Bridge, Osaka [http://www.beyond-innocence.org currently down?]

A good source for japanese experimental music:
http://japanimprov.com