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

Other days

slime

Slime Day
carpenters

Carpenters Day
coffee

Coffee Day
ruby

Ruby Day
bow tie

Bow Tie Day
lost sock memorial

Lost Sock Memorial Day
hannah

Hannah Day
nail polish

Nail Polish Day
fiancee

Fiancee Day
lisp

Lisp Day