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

Other days

camera

Camera Day
promposal

Promposal Day
stud

Stud Day
ponytail

Ponytail Day
bow tie

Bow Tie Day
self care

Self Care Day
ormille

Ormille Day
ride the wind

Ride The Wind Day
youth

Youth Day
tulip

Tulip Day