Oops, it doesn't look like 'peak confirmation bias day' is a national day..

Other days

bonang

Bonang Day
slime

Slime Day
kale

Kale Day
china

China Day
first love

First Love Day
nae nae

Nae Nae Day
one

One Day
fiancee

Fiancee Day
mean girls

Mean Girls Day
stress awareness

Stress Awareness Day