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

Other days

cuddle up

Cuddle Up Day
slime

Slime Day
comfy

Comfy Day
get funky

Get Funky Day
pumpkin

Pumpkin Day
ruby

Ruby Day
tulip

Tulip Day
hiv awareness

Hiv Awareness Day
one

One Day
bow tie

Bow Tie Day