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

Other days

youth

Youth Day
artists

Artists Day
bonang

Bonang Day
bow tie

Bow Tie Day
chocolate milkshake

Chocolate Milkshake Day
pampering

Pampering Day
raise awerness of zeus

Raise Awerness Of Zeus Day
boba

Boba Day
african immigrant and refugee hiv and hep awareness

African Immigrant And Refugee Hiv And Hep Awareness Day
eat what you want

Eat What You Want Day