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

Other days

boyfriend

Boyfriend Day
promposal

Promposal Day
lash

Lash Day
kale

Kale Day
ormille

Ormille Day
gum

Gum Day
boy friend

Boy Friend Day
ponytail

Ponytail Day
ask out your crush

Ask Out Your Crush Day
bounce

Bounce Day