Oops, it doesn't look like 'mobile number portabilityone day' is a national day..

Other days

camera

Camera Day
boba

Boba Day
gum

Gum Day
blanket fort

Blanket Fort Day
one

One Day
ask out your crush

Ask Out Your Crush Day
aloxolt

Aloxolt Day
lash

Lash Day
tulip

Tulip Day
bounce

Bounce Day