Oops, it doesn't look like 'End Every Sentence With A Song day' is a national day..

Other days

Pumpkin Day

Offer Day

Ormille Day

Frozen Yogurt Day

African Immigrant And Refugee Hiv And Hep Awareness Day

My Little Pony Day

Get Funky Day

Donate Your Hair Day

Chocolate Milkshake Day

Eat What You Want Day