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

Other days

blanket fort

Blanket Fort Day
lumpy rug

Lumpy Rug Day
boy friend

Boy Friend Day
cat girl

Cat Girl Day
tulip

Tulip Day
china

China Day
first love

First Love Day
unicorn

Unicorn Day
ruby

Ruby Day
special education

Special Education Day