hack4japan is a series of ideathon and hackathon events for Japan Tsunami relief and recovery effort. So far several meetings, ideathons and hackathons were held in March both online in English/Japanese and offline (Kyoto, Okayama, Tokushima, Fukuoka and Fukushima) in Japanese. The detail of the first event is here.
The next meeting will be held in Sendai city (Miyagi), Wakamatsu city (Fukushima),Tokyo in Japanese during 21st and 22nd May, and we will be also hosting a satellite event in London (UK) in English on 22nd May.