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

Other days

promposal

Promposal Day
boba

Boba Day
singles

Singles Day
martini

Martini Day
fiancee

Fiancee Day
stress awareness

Stress Awareness Day
boy friend

Boy Friend Day
kale

Kale Day
self care

Self Care Day
cuddle up

Cuddle Up Day