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

Other days

bounce

Bounce Day
slime

Slime Day
african immigrant and refugee hiv and hep awareness

African Immigrant And Refugee Hiv And Hep Awareness Day
tell a fairytale

Tell A Fairytale Day
boba

Boba Day
ask out your crush

Ask Out Your Crush Day
girl friend

Girl Friend Day
self appreciation

Self Appreciation Day
kiss a brunette

Kiss A Brunette Day
bow tie

Bow Tie Day