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

Other days

boba

Boba Day
my little pony

My Little Pony Day
african immigrant and refugee hiv and hep awareness

African Immigrant And Refugee Hiv And Hep Awareness Day
ask out your crush

Ask Out Your Crush Day
gallery

Gallery Day
bow tie

Bow Tie Day
slime

Slime Day
lash

Lash Day
hiv awareness

Hiv Awareness Day
ride the wind

Ride The Wind Day