Oops, it doesn't look like 'glory in the day' is a national day..

Other days

bow tie

Bow Tie Day
ask out your crush

Ask Out Your Crush Day
cuddle up

Cuddle Up Day
comfy

Comfy Day
law

Law Day
buddy

Buddy Day
slime

Slime Day
gallery

Gallery Day
youth

Youth Day
unicorn

Unicorn Day