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

Other days

hoodie

Hoodie Day
ponytail

Ponytail Day
ask out your crush

Ask Out Your Crush Day
stud

Stud Day
carpenters

Carpenters Day
nae nae

Nae Nae Day
lash

Lash Day
one

One Day
law

Law Day
gum

Gum Day