I checked Tokyogirl scheduler and unfortunately most of the idols groups I'm interested in don't do any shows in Tokyo during that week. The non-idol bands I follow don't either.
The only one I'm a little interested in is Palet. They're doing a show on Friday the 27th in Akihabara (culture theater something??). I might go to that one. I really would have liked to have seen Bish or Passcode or Himekyun.
There's also the metal band Galneryus, that I absolutely love, and they do a show the week before (this week).
Oh well... Maybe next time.