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

Other days

bow tie

Bow Tie Day
self care

Self Care Day
youth

Youth Day
eat what you want

Eat What You Want Day
lumpy rug

Lumpy Rug Day
pick me

Pick Me Day
aloxolt

Aloxolt Day
ride the wind

Ride The Wind Day
slime

Slime Day
singles

Singles Day