Oops, it doesn't look like 'collection of pelargoniums opens to the public day' is a national day..

Other days

Cuddle Up Day

Embarrass Your Best Friend Day

Bow Tie Day

Stud Day

Chocolate Milkshake Day

Appreciate Yaself A Lil Extra Day

Tell Ur Crush You Like Them Day

Artists Day

Girl Friend Day

Cat Girl Day