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

Other days

martini

Martini Day

my little pony

My Little Pony Day

stress awareness

Stress Awareness Day

bubble bath

Bubble Bath Day

self care

Self Care Day

comfy

Comfy Day

cuddle up

Cuddle Up Day

believe

Believe Day

one

One Day

african immigrant and refugee hiv and hep awareness

African Immigrant And Refugee Hiv And Hep Awareness Day