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

Other days

buddy

Buddy Day
lisp

Lisp Day
cuddle up

Cuddle Up Day
boy friend

Boy Friend Day
bubble bath

Bubble Bath Day
self care

Self Care Day
blanket fort

Blanket Fort Day
tulip

Tulip Day
aloxolt

Aloxolt Day
artists

Artists Day