Oops, it doesn't look like 'mourning following the deadly istanbul terrorist attack day' is a national day..

Other days

youth

Youth Day
lash

Lash Day
tell a fairytale

Tell A Fairytale Day
china

China Day
ruby

Ruby Day
frozen yogurt

Frozen Yogurt Day
ride the wind

Ride The Wind Day
african immigrant and refugee hiv and hep awareness

African Immigrant And Refugee Hiv And Hep Awareness Day
tulip

Tulip Day
eat what you want

Eat What You Want Day