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

Other days

pumpkin

Pumpkin Day
pick me

Pick Me Day
lumpy rug

Lumpy Rug Day
eat what you want

Eat What You Want Day
boy friend

Boy Friend Day
fiancee

Fiancee Day
frozen yogurt

Frozen Yogurt Day
hannah

Hannah Day
artists

Artists Day
china

China Day