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

Other days

african immigrant and refugee hiv and hep awareness

African Immigrant And Refugee Hiv And Hep Awareness Day
tulip

Tulip Day
bow tie

Bow Tie Day
boy friend

Boy Friend Day
mean girls

Mean Girls Day
cursing

Cursing Day
appreciate yaself a lil extra

Appreciate Yaself A Lil Extra Day
lash

Lash Day
cuddle up

Cuddle Up Day
hiv awareness

Hiv Awareness Day