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

Other days

ruby

Ruby Day
boba

Boba Day
camera

Camera Day
stress awareness

Stress Awareness Day
lumpy rug

Lumpy Rug Day
eat what you want

Eat What You Want Day
youth

Youth Day
prosecco

Prosecco Day
aloxolt

Aloxolt Day
comfy

Comfy Day