Oops, it doesn't look like 'ugly christmas sweater ugly christmas sweater day' is a national day..

Other days

latina equal pay

Latina Equal Pay Day
bow tie

Bow Tie Day
ruby

Ruby Day
hiv awareness

Hiv Awareness Day
self appreciation

Self Appreciation Day
emoji

Emoji Day
cat girl

Cat Girl Day
cuddle up

Cuddle Up Day
aloxolt

Aloxolt Day
my little pony

My Little Pony Day