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

Other days

cuddle up

Cuddle Up Day
prescription drug take back

Prescription Drug Take Back Day
hiv awareness

Hiv Awareness Day
african immigrant and refugee hiv and hep awareness

African Immigrant And Refugee Hiv And Hep Awareness Day
lisp

Lisp Day
artists

Artists Day
embarrass your best friend

Embarrass Your Best Friend Day
singles

Singles Day
comfy

Comfy Day
my little pony

My Little Pony Day