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

Other days

ormille

Ormille Day
polyamory

Polyamory Day
ruby

Ruby Day
buddy

Buddy Day
cuddle up

Cuddle Up Day
coffee

Coffee Day
tulip

Tulip Day
stud

Stud Day
ride the wind

Ride The Wind Day
aloxolt

Aloxolt Day