Oops, it doesn't look like 'letter of intent signees on signing day' is a national day..

Other days

kale

Kale Day
ponytail

Ponytail Day
girl friend

Girl Friend Day
self appreciation

Self Appreciation Day
boy friend

Boy Friend Day
self care

Self Care Day
chocolate milkshake

Chocolate Milkshake Day
slime

Slime Day
tell ur crush you like them

Tell Ur Crush You Like Them Day
kiss a ginger

Kiss A Ginger Day