Oops, it doesn't look like 'onion ring eclair day' is a national day..

Other days

blanket fort

Blanket Fort Day
youth

Youth Day
mean girls

Mean Girls Day
chocolate milkshake

Chocolate Milkshake Day
slime

Slime Day
china

China Day
law

Law Day
ormille

Ormille Day
ruby

Ruby Day
tulip

Tulip Day