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

Other days

cat girl

Cat Girl Day
healing

Healing Day
self appreciation

Self Appreciation Day
bounce

Bounce Day
nail polish

Nail Polish Day
ponytail

Ponytail Day
nae nae

Nae Nae Day
my little pony

My Little Pony Day
stud

Stud Day
boba

Boba Day