Oops, it doesn't look like 'extension of the school day' is a national day..

Other days

blanket fort

Blanket Fort Day
lumpy rug

Lumpy Rug Day
frozen yogurt

Frozen Yogurt Day
special education

Special Education Day
singles

Singles Day
carpenters

Carpenters Day
me

Me Day
bow tie

Bow Tie Day
my little pony

My Little Pony Day
bounce

Bounce Day