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

Other days

emoji

Emoji Day
brow

Brow Day
buddy

Buddy Day
chocolate milkshake

Chocolate Milkshake Day
cuddle up

Cuddle Up Day
artists

Artists Day
hiv awareness

Hiv Awareness Day
african immigrant and refugee hiv and hep awareness

African Immigrant And Refugee Hiv And Hep Awareness Day
me

Me Day
ask out your crush

Ask Out Your Crush Day