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

Other days

pick me

Pick Me Day
frozen yogurt

Frozen Yogurt Day
martini

Martini Day
boyfriend

Boyfriend Day
blanket fort

Blanket Fort Day
youth

Youth Day
bubble bath

Bubble Bath Day
eat what you want

Eat What You Want Day
ruby

Ruby Day
camera

Camera Day