Oops, it doesn't look like 'post a pic of the sky on snap day' is a national day..

Other days

gallery

Gallery Day
boy friend

Boy Friend Day
tell ur crush you like them

Tell Ur Crush You Like Them Day
emoji

Emoji Day
coffee

Coffee Day
reading

Reading Day
me

Me Day
artists

Artists Day
eat what you want

Eat What You Want Day
ponytail

Ponytail Day