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

Other days

one

One Day
bow tie

Bow Tie Day
mean girls

Mean Girls Day
aloxolt

Aloxolt Day
artists

Artists Day
self appreciation

Self Appreciation Day
tell a fairytale

Tell A Fairytale Day
believe

Believe Day
tell ur crush you like them

Tell Ur Crush You Like Them Day
me

Me Day