Oops, it doesn't look like 'baseball hall of fame day' is a national day..

Other days

camera

Camera Day
kale

Kale Day
coffee

Coffee Day
stud

Stud Day
boy friend

Boy Friend Day
boyfriend

Boyfriend Day
tell a fairytale

Tell A Fairytale Day
hoodie

Hoodie Day
ruby

Ruby Day
bow tie

Bow Tie Day