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

Other days

bounce

Bounce Day
comfy

Comfy Day
self care

Self Care Day
lash

Lash Day
lisp

Lisp Day
promposal

Promposal Day
martini

Martini Day
youth

Youth Day
azonto is acceptable

Azonto Is Acceptable Day
buddy

Buddy Day