Kei, Djokovic, and other tennis stars will join a fundraising event in Miami on March 23. They will play a soccer match and then join dinner with guests:
Also, Kei is working with the Red Cross in an fundraising efforts for Japan. There is a link to the Red Cross on his facebook. (http://www.facebook.com/keinishikori
Kei has also set up the Kei Nishikori Charitable Fund. Here's a link to a charity auction, with donatoins from many players.
The situation is still very unnerving here in Japan. More than 20,000 people are either dead or missing, and tens of thousands of people still live in shelters, many without heating (the worst affected areas are all in the northeastern Japan, which is very cold---it snowed last week.)
And the nuclear plant debacles---radiation levels in Tokyo is on the whole still low, but you'll never know what will happen. It's been very scary and stressful. Hope things will turn for the better soon...