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

Other days

ormille

Ormille Day
tulip

Tulip Day
my little pony

My Little Pony Day
bounce

Bounce Day
reading

Reading Day
fiancee

Fiancee Day
azonto is acceptable

Azonto Is Acceptable Day
ruby

Ruby Day
cursing

Cursing Day
gallery

Gallery Day