Oops, it doesn't look like 'anthem despite no home opening day' is a national day..

Other days

slime

Slime Day
cursing

Cursing Day
bow tie

Bow Tie Day
kiss a ginger

Kiss A Ginger Day
azonto is acceptable

Azonto Is Acceptable Day
appreciate yaself a lil extra

Appreciate Yaself A Lil Extra Day
artists

Artists Day
self appreciation

Self Appreciation Day
kiss a brunette

Kiss A Brunette Day
hiv awareness

Hiv Awareness Day