Hey you guys this is fake!
There's a chinese article about it.
Quote:
太陽報
步姐領軍來港開騷屬流料
網上近日有消息指avex年度晒冷騷「a-nation」，將巡迴中港台三地舉行！有指濱崎步、安室奈美惠、大塚愛、倖田來未及TRF等均會出席在7 月19日舉行的香港站。記者致電香港avex求證，發言人指以上歌手的檔期根本沒可能配合一同來港，相信只 是惡作劇。
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so basically the news was made up coz the reporter contacted Hong Kong Avex to confirm and they said the mentioned artists (ayu, namie, ai, koda, ayu, trf,etc) schedules is not possible for them to come to Hong kong together to perform.