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

Other days

hiv awareness

Hiv Awareness Day
nae nae

Nae Nae Day
frozen yogurt

Frozen Yogurt Day
get funky

Get Funky Day
boba

Boba Day
gum

Gum Day
pick me

Pick Me Day
nail polish

Nail Polish Day
ormille

Ormille Day
tulip

Tulip Day