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

Other days

gum

Gum Day
fiancee

Fiancee Day
china

China Day
eat what you want

Eat What You Want Day
brow

Brow Day
aloxolt

Aloxolt Day
lash

Lash Day
my little pony

My Little Pony Day
boy friend

Boy Friend Day
girl friend

Girl Friend Day