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

Other days

lash

Lash Day
blanket fort

Blanket Fort Day
eat what you want

Eat What You Want Day
buddy

Buddy Day
bounce

Bounce Day
stud

Stud Day
promposal

Promposal Day
china

China Day
ormille

Ormille Day
donate your hair

Donate Your Hair Day