Oops, it doesn't look like 'sindi van zyl day' is a national day..

Other days

law

Law Day
bow tie

Bow Tie Day
hannah

Hannah Day
cursing

Cursing Day
cuddle up

Cuddle Up Day
nae nae

Nae Nae Day
offer

Offer Day
bubble bath

Bubble Bath Day
ask out your crush

Ask Out Your Crush Day
aloxolt

Aloxolt Day