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

Other days

fiancee

Fiancee Day
promposal

Promposal Day
eat what you want

Eat What You Want Day
nae nae

Nae Nae Day
believe

Believe Day
special education

Special Education Day
get funky

Get Funky Day
coffee

Coffee Day
boba

Boba Day
hannah

Hannah Day