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The 8th of September is commemorated as Kaguya Houraisan's day because the date

9/8

can be read as "gu" (9) and "ya" (8) in Japanese

See also

* Cirno Day (9th September)

* Koishi Day (14th May and 14th June)

* Nazrin Day (20th July)

* Satori Day (10th March)

External links

* Article in pixiv encyclopedia