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

Other days

lash

Lash Day
get funky

Get Funky Day
cat girl

Cat Girl Day
boba

Boba Day
self care

Self Care Day
promposal

Promposal Day
self appreciation

Self Appreciation Day
reading

Reading Day
ponytail

Ponytail Day
coffee

Coffee Day