2021 Tokyo Marathon Officially Moved to October 17

 https://www.marathon.tokyo/en/news/detail/news_001791.html

Major Japanese marathons still scheduled to happen in 2020 and 2021 marathon announcements to date:

Dec. 6: Fukuoka International Marathon (370) - scheduled with limited field size
Dec. 20: Hofu Marathon (2,724) - scheduled with limited field size

2021

Jan. 10 - Ibusuki Nanohana Marathon (10,954) - canceled
Jan. 31 - Katsuta Marathon (10,627) - canceled
Jan. 31 - Osaka International Women's Marathon (423) - TBA
Feb. 7 - Beppu-Oita Marathon (3,141) - canceled
Feb. 14 - Ehime Marathon (9,554) - canceled
Feb. 14 - Nobeoka Nishi Nippon Marathon (536) - TBA
Feb. 21 - Kyoto Marathon (13,894) - canceled
Feb. 21 - Kochi Ryoma Marathon (10,924) - canceled
Feb. 21 - Kumamoto Castle Marathon (10,444) - canceled
Feb. 21 - Kitakyushu Marathon (9,485) - canceled
Feb. 21 - Okinawa Marathon (7,990) - canceled
Feb. 28 - Shonan International Marathon (16,821) - rescheduled from Dec. 6
Feb. 28 - Himeji Castle Marathon (6,938) - canceled
Feb. 28 - Iwaki Sunshine Marathon (5,259) - canceled
Feb. 28 - Lake Biwa Marathon (174) - TBA
Mar. 7 - Kagoshima Marathon (9.356) - TBA
Mar. 7 - Tokyo Marathon (151) - postponed to October 17
Mar. 14 - Shizuoka Marathon (9,802) - canceled
Mar. 14 - Nagoya Women's Marathon (96) - scheduled with limited field size

Mar. 21 - Itabashi City Marathon (13,310) - canceled
Mar. 21 - Koga Hanamomo Marathon (8,766) - canceled
Mar. 21 - Saga Sakura Marathon (8.509) - registrations postponed
Mar. 28 - Sakura Marathon (5,614) - TBA
Apr. 18 - Kasumigaura Marathon (10,096) - decision by end of October
Apr. 18 - Nagano Marathon (8,082) - decision by end of October