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

Other days

kiss a brunette

Kiss A Brunette Day
believe

Believe Day
reading

Reading Day
bow tie

Bow Tie Day
boba

Boba Day
book

Book Day
kale

Kale Day
boy friend

Boy Friend Day
my little pony

My Little Pony Day
slime

Slime Day