Oops, it doesn't look like 'planetarium is packed with students on day' is a national day..

Other days

youth

Youth Day
gum

Gum Day
cat girl

Cat Girl Day
get funky

Get Funky Day
ruby

Ruby Day
book

Book Day
self care

Self Care Day
martini

Martini Day
kale

Kale Day
lisp

Lisp Day