Oops, it doesn't look like 'park for mothers day' is a national day..

Other days

prosecco

Prosecco Day
kale

Kale Day
frozen yogurt

Frozen Yogurt Day
ormille

Ormille Day
fiancee

Fiancee Day
slime

Slime Day
bow tie

Bow Tie Day
boba

Boba Day
lisp

Lisp Day
get funky

Get Funky Day