Oops, it doesn't look like 'weather service offices release weather balloons twice a day' is a national day..

Other days

blanket fort

Blanket Fort Day
bounce

Bounce Day
youth

Youth Day
african immigrant and refugee hiv and hep awareness

African Immigrant And Refugee Hiv And Hep Awareness Day
girl friend

Girl Friend Day
cat girl

Cat Girl Day
tell ur crush you like them

Tell Ur Crush You Like Them Day
stud

Stud Day
self appreciation

Self Appreciation Day
boy friend

Boy Friend Day