Morning Musume '21 Ishida Ayumi & Sato Masaki FC Event ~Hiyoko ga 10nen Tattara, saa Nani ni Naru?~ "Maa Birthday Yattenai yo. Semete Ishou dake Kisasete!" "Iya, Title Nagai yo!" (モーニング娘。'21 10期メンバー 石田亜佑美＆佐藤優樹FCイベント～ひよこが10年経ったら、さぁ何になる？～『まーバースデーやってないよ。せめて衣装だけ着させて！』『いや、タイトル長いよ！』, Morning Musume '21 10th generation members Ishida Ayumi and Sato Masaki FC Event ~ The chicks are turning 10, so what will they become? ~ "It's not Maa's birthday. But at least let us wear the outfits!" "Oh no, this title's too long!" ) was Ishida Ayumi & Sato Masaki's joint 2021 fanclub event to celebrate it being over 10 years since they joined Morning Musume as 10th generation members. Two shows took place at Edogawa cultural center on October 1, 2021.