Oops, it doesn't look like 'museums shut for second museums are shut for a second day' is a national day..

Other days

Ride The Wind Day

Bounce Day

African Immigrant And Refugee Hiv And Hep Awareness Day

Get Funky Day

Chocolate Milkshake Day

Aloxolt Day

Eat What You Want Day

Emoji Day

Ruby Day

Raise Awerness Of Zeus Day