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

Other days

tulip

Tulip Day
book

Book Day
kiss a ginger

Kiss A Ginger Day
youth

Youth Day
ask out your crush

Ask Out Your Crush Day
bubble bath

Bubble Bath Day
slime

Slime Day
bow tie

Bow Tie Day
nail polish

Nail Polish Day
one

One Day