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

Other days

lumpy rug

Lumpy Rug Day
law

Law Day
brow

Brow Day
bow tie

Bow Tie Day
self appreciation

Self Appreciation Day
pumpkin

Pumpkin Day
hannah

Hannah Day
promposal

Promposal Day
donate your hair

Donate Your Hair Day
ruby

Ruby Day