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

Other days

ruby

Ruby Day
unicorn

Unicorn Day
lisp

Lisp Day
coffee

Coffee Day
frozen yogurt

Frozen Yogurt Day
promposal

Promposal Day
brow

Brow Day
special education

Special Education Day
first love

First Love Day
ride the wind

Ride The Wind Day