Oops, it doesn't look like 'post every single picture or video you have of you and all your friends on snapchat day' is a national day..

Other days

Boy Friend Day

Brow Day

Boba Day

Special Education Day

Nae Nae Day

Frozen Yogurt Day

Stud Day

Book Day

Cuddle Up Day

African Immigrant And Refugee Hiv And Hep Awareness Day