Oops, it doesn't look like 'board met in a day' is a national day..

Other days

ruby

Ruby Day
girl friend

Girl Friend Day
kiss a ginger

Kiss A Ginger Day
hannah

Hannah Day
boy friend

Boy Friend Day
self care

Self Care Day
boba

Boba Day
slime

Slime Day
one

One Day
ponytail

Ponytail Day