2020 was the year in which Morning Musume '19 changed their name to Morning Musume '20 and Funaki Musubu graduates from ANGERME.
Members
- January 1: Morning Musume '19 becomes Morning Musume '20.
- March: Funaki Musubu graduates from ANGERME
Singles
- January 15: Dakishimerarete Mitai / TBA - Tsubaki Factory
- January: KOKORO&KARADA - Morning Musume '20
Albums
- January 8: Petit Best 20 2020 - Hello! Project
DVDs/Blu-rays
- January 8: Kobushi Factory Live Tour 2019 Aki ~Punching the air! Special~ (DVD & Blu-ray)
Concerts
- January 2 - Feburary 24: Hello! Project 2020 Winter
Anniversaries
- 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 24: Kobushi Factory Day (Kobushi no Hi)
- May 26: ANGERME's major debut 10th anniversary
- August 7: BEYOOOOONDS's major debut 1st anniversary
- September 2: Kobushi Factory's major debut 5th 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 |