Oops, it doesn't look like 'records for most blood donations in one day' is a national day..

Other days

buddy

Buddy Day
first love

First Love Day
girl friend

Girl Friend Day
my little pony

My Little Pony Day
boy friend

Boy Friend Day
bow tie

Bow Tie Day
believe

Believe Day
pick me

Pick Me Day
me

Me Day
tulip

Tulip Day