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

Other days

coffee

Coffee Day
gum

Gum Day
reading

Reading Day
ask out your crush

Ask Out Your Crush Day
bow tie

Bow Tie Day
kiss a ginger

Kiss A Ginger Day
pick me

Pick Me Day
tulip

Tulip Day
get funky

Get Funky Day
bubble bath

Bubble Bath Day