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

Other days

boba

Boba Day
bonang

Bonang Day
unicorn

Unicorn Day
promposal

Promposal Day
slime

Slime Day
self appreciation

Self Appreciation Day
latina equal pay

Latina Equal Pay Day
hannah

Hannah Day
nae nae

Nae Nae Day
ruby

Ruby Day