Oops, it doesn't look like 'zach walz day' is a national day..

Other days

slime

Slime Day
offer

Offer Day
boba

Boba Day
camera

Camera Day
bow tie

Bow Tie Day
nail polish

Nail Polish Day
youth

Youth Day
kiss a brunette

Kiss A Brunette Day
gum

Gum Day
pampering

Pampering Day