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

Other days

brow

Brow Day
bow tie

Bow Tie Day
youth

Youth Day
kiss a ginger

Kiss A Ginger Day
lost sock memorial

Lost Sock Memorial Day
singles

Singles Day
unicorn

Unicorn Day
tulip

Tulip Day
lumpy rug

Lumpy Rug Day
promposal

Promposal Day