Oops, it doesn't look like 'move up a weight class day' is a national day..

Other days

comfy

Comfy Day
tulip

Tulip Day
frozen yogurt

Frozen Yogurt Day
pick me

Pick Me Day
boba

Boba Day
singles

Singles Day
lisp

Lisp Day
bonang

Bonang Day
get funky

Get Funky Day
kale

Kale Day