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

Other days

ponytail

Ponytail Day
artists

Artists Day
law

Law Day
nae nae

Nae Nae Day
gallery

Gallery Day
pick me

Pick Me Day
frozen yogurt

Frozen Yogurt Day
bonang

Bonang Day
eat what you want

Eat What You Want Day
tulip

Tulip Day