Oops, it doesn't look like 'disappear for a couple hours in the middle of the day' is a national day..

Other days

carpenters

Carpenters Day

hoodie

Hoodie Day

Me Day

pick me

Pick Me Day

latina equal pay

Latina Equal Pay Day

youth

Youth Day

slime

Slime Day

first love

First Love Day

gum

Gum Day

tell a fairytale

Tell A Fairytale Day