Oops, it doesn't look like 'tweet about clouds day' is a national day..

Other days

boy friend

Boy Friend Day
bubble bath

Bubble Bath Day
pick me

Pick Me Day
ruby

Ruby Day
girl friend

Girl Friend Day
stud

Stud Day
kale

Kale Day
azonto is acceptable

Azonto Is Acceptable Day
boba

Boba Day
gum

Gum Day