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

Other days

bounce

Bounce Day
blanket fort

Blanket Fort Day
youth

Youth Day
nae nae

Nae Nae Day
boyfriend

Boyfriend Day
ormille

Ormille Day
mean girls

Mean Girls Day
promposal

Promposal Day
bow tie

Bow Tie Day
stud

Stud Day