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

Other days

camera

Camera Day
one

One Day
eat what you want

Eat What You Want Day
unicorn

Unicorn Day
lumpy rug

Lumpy Rug Day
artists

Artists Day
mean girls

Mean Girls Day
first love

First Love Day
boba

Boba Day
bounce

Bounce Day