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

Other days

brow

Brow Day

hoodie

Hoodie Day

Emoji Day

self appreciation

Self Appreciation Day

first love

First Love Day

aloxolt

Aloxolt Day

african immigrant and refugee hiv and hep awareness

African Immigrant And Refugee Hiv And Hep Awareness Day

stress awareness

Stress Awareness Day

latina equal pay

Latina Equal Pay Day

carpenters

Carpenters Day