Oops, it doesn't look like 'wingmen day' is a national day..

Other days

coffee

Coffee Day

nae nae

Nae Nae Day

kale

Kale Day

african immigrant and refugee hiv and hep awareness

African Immigrant And Refugee Hiv And Hep Awareness Day

stress awareness

Stress Awareness Day

singles

Singles Day

slime

Slime Day

carpenters

Carpenters Day

donate your hair

Donate Your Hair Day

lumpy rug

Lumpy Rug Day