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

Other days

slime

Slime Day
blanket fort

Blanket Fort Day
boy friend

Boy Friend Day
unicorn

Unicorn Day
buddy

Buddy Day
girl friend

Girl Friend Day
offer

Offer Day
promposal

Promposal Day
cursing

Cursing Day
carpenters

Carpenters Day