- January 1: Morning Musume '19 becomes Morning Musume '20.
- February 28: Oota Haruka is suspended from all activities.
- March 22: Murota Mizuki graduates from ANGERME and Hello! Project.
- March 30:
- Spring: Funaki Musubu graduates from ANGERME and Hello! Project.
- June: Miyamoto Karin graduates from Juice=Juice and Hello! Project.
- January 15: Ishiki Takai Otome no Dilemma / Dakishimerarete Mitai - Tsubaki Factory
- January 22: KOKORO&KARADA / LOVEpedia / Ningen Kankei No way way - Morning Musume '20
- March 4: Seishun no Hana / Start Line - Kobushi Factory
- April 1: Pop Music / Suki tte Itte yo - Juice=Juice
- February 8:
- February 23:
- January 8: Kobushi Factory Live Tour 2019 Aki ~Punching the air! Special~ (DVD & Blu-ray)
- January 22: The Girls Live Vol.63 (DVD)
- February 5: ANGERME 2019 Aki "Next Page" ~Katsuta Rina Sotsugyou Special~ (DVD & Blu-ray)
- February 12: The Girls Live Vol.64 (DVD)
- February 26: Reborn ~13nin no Tamashii wa Kami-sama no Yume wo Miru~ (DVD)
- March 11:
- The Girls Live Vol.65 (DVD)
- Country Girls Kessei 5 Shuunen Kinen Event ~Go for the future!!!!~ (DVD)
- March 25:
- April 1: ANGERME Live Tour 2019 Natsu Aki "Next Page" ~Nakanishi Kana Sotsugyou Special~ (DVD & Blu-ray)
- April 8: Country Girls Live 2019 ~Itooshikutte Gomen ne~ (DVD & Blu-ray)
- April 22: Morning Musume '19 Concert Tour Aki ~KOKORO&KARADA~ FINAL (DVD & Blu-ray)
- April 29: LIVE BEYOOOOOND1St (DVD & Blu-ray)
- May 20: Hello! Project COUNTDOWN PARTY 2019 ~GOOD BYE & HELLO!~ (Blu-ray)
- January 2 - February 24: Hello! Project 2020 Winter
- January 27 - February 19: Kanazawa Tomoko LIVE 2020 ~Rose Quartz~
- February 3 - May 10: Juice=Juice LIVE TOUR 2020 ~NEW SENSATION~
- February 9 - May 17: ANGERME Live Tour 2020 Fuyu Haru ROCK ON! LOCK ON!
- February 22 - June 6: Tsubaki Factory Live Tour 2020 Haru Tsubaki
- March 14 - June 7: Morning Musume '20 Concert Tour Haru ~MOMM~
- March 15 - March 20: Hello! Project Kenshuusei Happyoukai 2020 3gatsu ~Tsumugu~
- March 20 - March 22: Hello! Project Hina Fes 2020 ~Hisaichi Fukkou Shien Tohoku wo Genki ni!~
- March 8 - May 31: BEYOOOOONDS 1st LIVE TOUR 2020 ~Pop! Step! Zen Onpu!!~
- March 29 - April 5: Morning Musume '20 Dinner Show "Happy Night"
- March 30: Kobushi Factory Live 2020 ~The Final Ring!~
- April 11 - May 23: ANGERME Concert Tour 2020 Haru ROCK ON! LOCK ON!
- April 25 - May 31: Juice=Juice CONCERT TOUR 2020 Haru
- February 22 - February 23: Kobushi Factory Fanclub Tour "Smile For You!!!!!" in Shizuoka
- March 12:
- January 7: Morning Musume '20 Ishida Ayumi Birthday Event
- January 8: Juice=Juice Inaba Manaka Birthday Event in Sapporo
- January 20: ANGERME Ise Layla Birthday Event 2020
- January 24: Juice=Juice Uemura Akari Birthday Event in Osaka
- February 3: Morning Musume '20 Makino Maria Birthday Event
- February 10: Kobushi Factory Nomura Minami Birthday Event 2020
- February 20: Morning Musume '20 Morito Chisaki Birthday Event
- February 25: Morning Musume '20 Yokoyama Reina Birthday Event
- February 26: BEYOOOOONDS / CHICA#TETSU Ichioka Reina Birthday Event 2020
- March 9:
Kobushi Factory Wada Sakurako Birthday Event 2020(cancelled)
- March 16: BEYOOOOONDS / Ame no Mori Kawa Umi Takase Kurumi Birthday Event 2020
- March 18: Morning Musume '20 Haga Akane Birthday Event
- March 24: Morning Musume '20 Oda Sakura Birthday Event ~Sakura no Shirabe 9~
- March 25: Morning Musume '20 Kitagawa Rio Birthday Event
- April 17 - April 26: Arabeyooooonds Nights
- January 11: ANGERME ONLY ONE Audition ~Watashi wo Tsukuru no wa Watashi~ begins.
- February 15: ANGERME ONLY ONE Audition ~Watashi wo Tsukuru no wa Watashi~ application deadline.
- January 1: Hello Pro Maruwakari BOOK 2020 WINTER
- January 2: You ~You make me~ - Inoue Rei
- January 7: believe in oneself - Ishida Ayumi
- February 2: Maria19 - Makino Maria
- March 7: Akane - Haga Akane
- January 2: Kobushi Factory's formation 5th anniversary
- January 28: Morning Musume's major debut 22nd anniversary
- February 3: Juice=Juice's formation 7th anniversary
- February 22: Tsubaki Factory's major debut 3rd anniversary
- April 4: ANGERME's formation 11th anniversary
- April 29: Tsubaki Factory's formation 5th anniversary
- May 26: ANGERME's major debut 10th anniversary
- August 7: BEYOOOOONDS's major debut 1st anniversary
- September 11: Juice=Juice's major debut 7th anniversary
- September 14: Morning Musume's formation 23rd anniversary
- October 10: Juice=Juice Day (JuuJuu no Hi)
- October 19: BEYOOOOONDS's formation 2nd anniversary
|2010 ・・ 2019 ・ 2020 ・ 2021 ・・ 2030|
Community content is available under CC-BY-SA unless otherwise noted.