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

Other days

ponytail

Ponytail Day
eat what you want

Eat What You Want Day
fiancee

Fiancee Day
nail polish

Nail Polish Day
youth

Youth Day
ruby

Ruby Day
healing

Healing Day
pick me

Pick Me Day
slime

Slime Day
camera

Camera Day