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

Other days

my little pony

My Little Pony Day
bow tie

Bow Tie Day
youth

Youth Day
frozen yogurt

Frozen Yogurt Day
one

One Day
polyamory

Polyamory Day
first love

First Love Day
carpenters

Carpenters Day
believe

Believe Day
nae nae

Nae Nae Day