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

Other days

cuddle up

Cuddle Up Day
hannah

Hannah Day
unicorn

Unicorn Day
bounce

Bounce Day
blanket fort

Blanket Fort Day
ask out your crush

Ask Out Your Crush Day
law

Law Day
bonang

Bonang Day
youth

Youth Day
believe

Believe Day