Oops, it doesn't look like 'Nike Air Max day' is a national day..

Other days

lisp

Lisp Day
lost sock memorial

Lost Sock Memorial Day
martini

Martini Day
kale

Kale Day
aloxolt

Aloxolt Day
unicorn

Unicorn Day
my little pony

My Little Pony Day
bow tie

Bow Tie Day
coffee

Coffee Day
first love

First Love Day