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

Other days

prosecco

Prosecco Day
offer

Offer Day
tulip

Tulip Day
youth

Youth Day
blanket fort

Blanket Fort Day
stud

Stud Day
kiss a brunette

Kiss A Brunette Day
buddy

Buddy Day
boy friend

Boy Friend Day
special education

Special Education Day