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

Other days

ruby

Ruby Day
believe

Believe Day
fiancee

Fiancee Day
self care

Self Care Day
blanket fort

Blanket Fort Day
lost sock memorial

Lost Sock Memorial Day
youth

Youth Day
ormille

Ormille Day
get funky

Get Funky Day
china

China Day