Oops, it doesn't look like 'pushups for charity day' is a national day..

Other days

unicorn

Unicorn Day
book

Book Day
nae nae

Nae Nae Day
gum

Gum Day
get funky

Get Funky Day
believe

Believe Day
stud

Stud Day
law

Law Day
kiss a ginger

Kiss A Ginger Day
promposal

Promposal Day