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

Other days

boyfriend

Boyfriend Day
prosecco

Prosecco Day
martini

Martini Day
girl friend

Girl Friend Day
stud

Stud Day
embarrass your best friend

Embarrass Your Best Friend Day
bow tie

Bow Tie Day
buddy

Buddy Day
boy friend

Boy Friend Day
slime

Slime Day