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

Other days

lash

Lash Day
boyfriend

Boyfriend Day
bounce

Bounce Day
cursing

Cursing Day
boba

Boba Day
girl friend

Girl Friend Day
boy friend

Boy Friend Day
nail polish

Nail Polish Day
polyamory

Polyamory Day
pick me

Pick Me Day