Oops, it doesn't look like 'underwear breathe in and out day' is a national day..

Other days

artists

Artists Day
embarrass your best friend

Embarrass Your Best Friend Day
nae nae

Nae Nae Day
youth

Youth Day
self appreciation

Self Appreciation Day
tell ur crush you like them

Tell Ur Crush You Like Them Day
coffee

Coffee Day
african immigrant and refugee hiv and hep awareness

African Immigrant And Refugee Hiv And Hep Awareness Day
self care

Self Care Day
promposal

Promposal Day