KANAKO posted an instagram to PR the Blu-ray of 10th anniversary live.

Today, "10th Anniversary live The Diamond Four -in 桃響導夢-" Blu-ray was released. ('桃,響,導,夢' means "peach", "sound", "lead", "dream" in English, and in Japanese pronunciation it is the same as "Tokyo dome")

KANAKO released an instagram related to this, and added comments  as "7 months ago..."
The first picture seems to have been performing a live rehearsal.

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10周年ライブのBlu-ray&DVDが発売になりました。7ヶ月前かぁ。

百田夏菜子 ももいろクローバーZさん(@kanakomomota_official)がシェアした投稿 - 2018年12月月18日午前7時38分PST