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

Other days

artists

Artists Day
cuddle up

Cuddle Up Day
boyfriend

Boyfriend Day
book

Book Day
my little pony

My Little Pony Day
carpenters

Carpenters Day
slime

Slime Day
stud

Stud Day
one

One Day
ruby

Ruby Day