Just relaying what Akudaikan confirmed. I'll try to make it, though money is a bit of a problem right now.
Date : Sat. April 24th, 2010
Time : 8PM, Ikebukuro East Exit (near the Seibu Exit)
Where : Dontei (Ikebukuro)
What : Shabu-shabu (because everyone keeps asking for it)
Price : 2000 yen (all you can eat/drink (soft drinks))
So far, 9 people have been confirmed as going. Even mix of Japanese/non so far.
More details as they come. Details subject to change.