Oops, it doesn't look like 'no rhyme nor reason day' is a national day..

Other days

african immigrant and refugee hiv and hep awareness

African Immigrant And Refugee Hiv And Hep Awareness Day
book

Book Day
chocolate milkshake

Chocolate Milkshake Day
slime

Slime Day
lost sock memorial

Lost Sock Memorial Day
prescription drug take back

Prescription Drug Take Back Day
gum

Gum Day
stress awareness

Stress Awareness Day
nae nae

Nae Nae Day
kiss a ginger

Kiss A Ginger Day