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

Other days

ruby

Ruby Day
offer

Offer Day
frozen yogurt

Frozen Yogurt Day
one

One Day
donate your hair

Donate Your Hair Day
my little pony

My Little Pony Day
cursing

Cursing Day
coffee

Coffee Day
bow tie

Bow Tie Day
unicorn

Unicorn Day