I think Misa already mentioned all the crucial information.

Regarding the goods, I also wanted to buy my goodies before the concert started, just as Suteisi. It's part of the experience but most of all (for me), I buy it FOR the concert, to be part of the shiny cheerful crowd

. And so that I have a memory, like I can say "I wore this shirt during the concert" and stuff. Even though you have to wait in those lines around 40 to 60 minutes, it's really cool.
Have lots of fun at the show!! POWER of MUSIC is a really awesome and special concert (saw it in July this year.

). Please write a report for us afterwards

I would like to know how the show changed from back when I saw it.
And by the way, it's so cool that you can stay in Japan for your studies.