Oops, it doesn't look like 'park plane flights during the labor day' is a national day..

Other days

african immigrant and refugee hiv and hep awareness

African Immigrant And Refugee Hiv And Hep Awareness Day
pumpkin

Pumpkin Day
my little pony

My Little Pony Day
hiv awareness

Hiv Awareness Day
pick me

Pick Me Day
special education

Special Education Day
hoodie

Hoodie Day
ask out your crush

Ask Out Your Crush Day
boy friend

Boy Friend Day
prosecco

Prosecco Day