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

Other days

believe

Believe Day

embarrass your best friend

Embarrass Your Best Friend Day

reading

Reading Day

nail polish

Nail Polish Day

bow tie

Bow Tie Day

boyfriend

Boyfriend Day

boy friend

Boy Friend Day

slime

Slime Day

my little pony

My Little Pony Day

self care

Self Care Day