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

Other days

carpenters

Carpenters Day

unicorn

Unicorn Day

law

Law Day

boba

Boba Day

Emoji Day

african immigrant and refugee hiv and hep awareness

African Immigrant And Refugee Hiv And Hep Awareness Day

tulip

Tulip Day

prescription drug take back

Prescription Drug Take Back Day

self care

Self Care Day

azonto is acceptable

Azonto Is Acceptable Day