Oops, it doesn't look like 'pants on to tweet day' is a national day..

Other days

gum

Gum Day
bubble bath

Bubble Bath Day
bow tie

Bow Tie Day
carpenters

Carpenters Day
nae nae

Nae Nae Day
me

Me Day
hot chocolate

Hot Chocolate Day
self care

Self Care Day
camera

Camera Day
unicorn

Unicorn Day