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

Other days

slime

Slime Day
coffee

Coffee Day
hiv awareness

Hiv Awareness Day
eat what you want

Eat What You Want Day
martini

Martini Day
singles

Singles Day
unicorn

Unicorn Day
nail polish

Nail Polish Day
bow tie

Bow Tie Day
get funky

Get Funky Day