Oops, it doesn't look like 'namesake day' is a national day..

Other days

kale

Kale Day
tell ur crush you like them

Tell Ur Crush You Like Them Day
african immigrant and refugee hiv and hep awareness

African Immigrant And Refugee Hiv And Hep Awareness Day
pumpkin

Pumpkin Day
self appreciation

Self Appreciation Day
aloxolt

Aloxolt Day
self care

Self Care Day
gum

Gum Day
ponytail

Ponytail Day
buddy

Buddy Day