Oops, it doesn't look like 'smile small towel day' is a national day..

Other days

blanket fort

Blanket Fort Day
pick me

Pick Me Day
cursing

Cursing Day
stud

Stud Day
unicorn

Unicorn Day
brow

Brow Day
reading

Reading Day
ormille

Ormille Day
coffee

Coffee Day
bow tie

Bow Tie Day