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

Other days

gum

Gum Day
cuddle up

Cuddle Up Day
aloxolt

Aloxolt Day
frozen yogurt

Frozen Yogurt Day
stress awareness

Stress Awareness Day
law

Law Day
stud

Stud Day
cursing

Cursing Day
ruby

Ruby Day
eat what you want

Eat What You Want Day