Just like the NA side some JP players not happy with how the new live event is taking place how it's completely random, timing is random, location is random, and on top of that you have 16 player limit so they started a thread talking about it and Rep responded to this one.

Quote Originally Posted by Duckbill View Post
今晩は、
Good evening,

進行中のコンテンツである都合上説明できない点が多くなってしまいますが、ここ で議論して頂いている内容は、ちゃんとフィードバックされています。意見感想、アイデアは今後の内容に反映されて行きますので、その点はご心配無きようお 願いします（内容によりますので、反映されなかったりもします）。
Since this is regarding currently on going content so there are parts which I can't explain due to reasons but we are taking your feedbacks from this thread and suggestions/ideas will be reflected on future content so please don't worry about that. (It depends on the content so it may not reflect on some)

ではお話出来る範囲で。
Now onto the part I can talk about.

最後の郡民は通常のクエストと は異なり、ライブイベントに属するものです。何人かの方が推察されている通り、ライブイベントとは突発的・断続的に発生する局所的な現象、と言う位置づけ のものです。システム的なものと、ゲーム内スタッフが介在するものとが含まれ、発生時間不定、発生場所不定です（よく見ると定期的に見えなくも無い場合が ありますが、一応不定です）。
The current content is different from a quest and it's related to the live event. Few have mentioned for live event it's something that happens suddenly there are some which are done through the system and some which staff actually does in-game. The location and timing is unknown it may look at specific time but it's generally unknown.

最後の郡民の他にもライブイベントが存在します。どういう物が幾つあるかと言う点は、非公開です。
Also there are other live events, what kind and how many is disclosed information.

参加したくても参加出来ていない、と言う方には全く申し開きも無いのですが…そういう事もある代物です。
There are those who want to participate but can't, for those I apologize but please understand there are these type of events as well.

取 れないヒストリーが出る、と言う点も仰る通りなのですが…これは「期間限定コンテンツ全般」の命題になると思います。なので、ここでは深く触れないでおき たい話ですが、ライブイベントではヒストリーしか発生せず、アチーブメントは発生していない事だけお知らせしておきます。
You're right that you can't obtain the history because of this but this is a limited time content. It doesn't affect the achievement and only history so please don't worry about that as well.
Some players not happy with this response. I responded they could at least increase the frequency instead of having 2-3 times per day with 16 players limit per run.