If you go to a LIVE of them in Japan you could be so kind to tell them your opinion.
But what do they ask you?

ps.  you don’t need to write your name, address and phone number.
Also only writing down your impression is alright too.

年月日 – YEAR/MONTH/DAY
会場名 venue name

本日はご来場頂き有り難う御座います
Thank you very much for coming today.
今後の活動の貴重な参考にしたいと思い
We would like to have valuable reference for our future work. 
ますので、アンケートにご協力下さい。
We would be thankful if you could answer our questionnaire.

本日はどのバンドを観に来ましたか？ Which band did you come to see today?
本日のLIVEは何で知りました？
today’s live information, how did you discovered? (blog, facebook, twitter, band, etc)

LIVEの感想、またはバンドに対しての要望などを書き下さい。
Please write your impression and or demands for the band of todays LIVE.

男 * 女 Male / female
を名前 your name
住所 your address
mail -> e-mail address
電話番号 * 携帯番号 phone number * mobile number
DMを希望しますか？ Is it OK to DM you?

Questionnairy could look like this.
If you find a different one, please take one or 2 more with you and share it with me. I would be very glad with it (^.-)

questionnaire2