Hi guys

,
I'm a new member of Japan forum !
Well I want to travel to Tokyo in December ,
firstly to visit the city and because my favorite jpop band will do a concert in the Tokyo Dome on the 30th december and I wanted to know how does it works , where can I buy it ?
So if you know the answer please help because i'm really found of this music's group and I really really don't want to miss them !!!
Thanks