Oops, it doesn't look like 'this and that day' is a national day..

Other days

singles

Singles Day
lost sock memorial

Lost Sock Memorial Day
boy friend

Boy Friend Day
get funky

Get Funky Day
hannah

Hannah Day
offer

Offer Day
believe

Believe Day
gum

Gum Day
pick me

Pick Me Day
nae nae

Nae Nae Day