Oops, it doesn't look like 'instead of columbus day' is a national day..

Other days

carpenters

Carpenters Day
ruby

Ruby Day
bounce

Bounce Day
slime

Slime Day
my little pony

My Little Pony Day
youth

Youth Day
boy friend

Boy Friend Day
nail polish

Nail Polish Day
stud

Stud Day
nae nae

Nae Nae Day