Oops, it doesn't look like 'monument campus groundbreaking ceremony held on labor day' is a national day..

Other days

boyfriend

Boyfriend Day
blanket fort

Blanket Fort Day
carpenters

Carpenters Day
self appreciation

Self Appreciation Day
pampering

Pampering Day
prosecco

Prosecco Day
camera

Camera Day
martini

Martini Day
azonto is acceptable

Azonto Is Acceptable Day
bow tie

Bow Tie Day