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

Other days

believe

Believe Day
self appreciation

Self Appreciation Day
ruby

Ruby Day
special education

Special Education Day
self care

Self Care Day
fiancee

Fiancee Day
cuddle up

Cuddle Up Day
bonang

Bonang Day
lost sock memorial

Lost Sock Memorial Day
tell a fairytale

Tell A Fairytale Day