I'll keep this updated throughout the day.
The Hawks plan on inviting an undisclosed number of earthquake / tsunami victims, currently taking refuge in Fukuoka, to their game on 5/5 (vs Rakuten). 5/5 also happens to be Children's Day.
Chiba Lotte Marines
The Marines announced today that they'll be selling charity tickets for games between 5/13 - 5/15 (vs Rakuten at QVC Marine) at the 2011 Doki Doki Flea Market at Markuhari Messe (5/3 - 5/5). The charity tickets will cost 2,000 yen (non-reserved infield seat tickets that usually go for 2,300 yen) a piece, of which about 1,700 yen of that will be donated to the Japanese Red Cross Society.
Saburo will be inviting 100 earthquake / tsunami victims from Asahi, Chiba to three games between 4/29 - 5/1 (vs Softbank at QVC Marine).
Nippon Ham Fighters
The Fighters announced that they'll invite around 150 earthquake / tsunami victims, currently taking refuge in Sapporo, to a game on 4/30 at Sapporo Dome (vs Seibu).
The game balls from the Eagles' victories on 4/12 and 4/15 will be on display at the Miyagi prefectural offices between the 26th and 28th.
The Eagles installed two seismometers (one on the first floor and one on the 5th floor) at Kleenex Stadium in order to ensure fan safety. The seismographs are the same kind used by JR along their Shinkansen train lines.
The Eagles announced today that they'll donate 1M yen to disaster recovery efforts (specifically, to help orphaned children) for every victory they record this year. Team president Hiroshi Mikitani, Senichi Hoshino, the Eagles' player's association, and the club itself will all chip in.
The Japan Amateur Baseball Association (JABA) announced that members of their association managed to raise about 4.6M yen in donations for recovery efforts in northern Japan.