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

Other days

frozen yogurt

Frozen Yogurt Day
tulip

Tulip Day
tell a fairytale

Tell A Fairytale Day
martini

Martini Day
lisp

Lisp Day
kale

Kale Day
bonang

Bonang Day
bow tie

Bow Tie Day
fiancee

Fiancee Day
lost sock memorial

Lost Sock Memorial Day