Oops, it doesn't look like 'get in an accident day' is a national day..

Other days

singles

Singles Day
lumpy rug

Lumpy Rug Day
nail polish

Nail Polish Day
frozen yogurt

Frozen Yogurt Day
gum

Gum Day
kiss a ginger

Kiss A Ginger Day
lisp

Lisp Day
boba

Boba Day
nae nae

Nae Nae Day
slime

Slime Day