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

Other days

buddy

Buddy Day
nail polish

Nail Polish Day
lash

Lash Day
cat girl

Cat Girl Day
azonto is acceptable

Azonto Is Acceptable Day
bubble bath

Bubble Bath Day
cuddle up

Cuddle Up Day
gallery

Gallery Day
slime

Slime Day
boba

Boba Day