satori day
3月10日はさとりの日 11月11日はさとりの日 11月11日はいいさとりの日
The 10th of March is Satori day, because the numbers 3 1 0 can be read as sa(n) (hi)to(tsu) rei.
The 11th of November is an additional day dedicated to Satori which is a reference to her rating herself 11/11 in Strange Creators of Outer World.
See also
- Cirno Day (9th September)
- Kaguya Day (8th September)
- Koishi Day (14th May and 14th June)
- Nazrin Day (20th July)
- SatoKoi day